Engineers in Camp
A full surveying party consists of the front flag-man, with his corps of axe-men to cut away trees and bushes; the transit-man, who records the distances and angles of the line, assisted by his chain-men and flag-men; and lastly the leveller, who takes and records the levels, with his rod-men and axe-men. The chief of the party exercises a general supervision over all, and is sometimes assisted by a topographer, who sketches in his book the contours of the hills and direction and size of the watercourses. One tent contains the cook, the commissary, and the provisions; another tent or two the working party, and another the superior engineers, with their drawing instruments and boards. In a properly regulated party the map and profile of the day's work should be plotted before going to bed, so as to see if all is right. If it turns out that the line can be improved and easier grades got, or other changes made, now is the time to do it.
Making an Embankment
After the railway line has been finally located, the next duty of the engineers is to prepare the work for letting. Land-plans are made, from which the right of way is secured. From the sections, the quantities are taken out. Plans of bridges and culverts are made; and a careful specification of all the works on the line is drawn up. The works are then let, either to one large contractor or to several smaller ones, and the labor of construction begins. The duties of the engineers are to stake out the work for the contractors, make monthly returns of its progress, and see that it is well done and according to the specifications and contract. The line is divided into sections, and an engineer, with his assistants, is placed in charge of each. Where the works are heavy, the contractors build shanties for their men and teams near the heavy cuttings or embankments. It is the custom to take out heavy cuttings by means of the machine called a steam shovel, which will dig as many yards in a day as 500 men.
Pope's Cantilever in Process of Erection
The most notable invention of latter days in bridge construction is that of the cantilever bridge, which is a system devised to dispense with staging, or false works, where from the great depth, or the swift current, of the river, this would be difficult, or, as in the case of the Niagara River, impossible to make. The first design of which we have any record was that of a bridge planned by Thomas Pope, a ship carpenter of New York, who, in 1810, published a book giving his designs for an arched bridge of timber across the North River at Castle Point, of 2,400 feet span. Mr. Pope called this an arch, but his description clearly shows it to have been what we now call a cantilever. As was the fashion of the day, he indulged in a poetical description: "Like half a Rainbow rising on yon shore, While its twin partner spans the semi o'er, And makes a perfect whole that need not part Till time has furnish'd us a nobler art." Note : This bridge was never built - it would be impossible in wood.
General View of the Poughkeepsie Bridge
The new bridge at Poughkeepsie has three of these cantilevers, connected by two fixed spans, as shown in the illustration. The fixed spans have horizontal lower chords, and really extend beyond each pier and up the inclined portions, to where the bottom chord of the cantilever is horizontal. At these points the junctions between the spans are made, and arranged in such a way, by means of movable links, that expansion and contraction due to changes of temperature can take place. The fixed spans are 525 feet long. Their upper chord, where the tracks are placed, is 212 feet above water. These spans required stagings to build them upon. These stagings were 220 feet above water, and rested on piles, driven through 60 feet of water and 60 feet of mud, making the whole height of the temporary staging 332 feet, or within 30 feet of the height of Trinity Church steeple, in New York. The time occupied in building one of these stagings and then erecting the steel-work upon it was about four months. The cantilever spans were erected without any stagings at all below, and entirely from the two overhead travelling scaffolds, shown in the engraving. These scaffolds were moved out daily from the place of beginning over the piers, until they met in the centre. The workmen hoisted up the different pieces of steel from a barge in the river below and put them into place, using suspended planks to walk upon. The time saved by this method was so great that one of these spans of 548 feet long was erected in less than four weeks, or one-seventh of the time which would have been required if stagings had been used.
The earth with a segment removed to show supposed internal zones
Crust (6-30 miles) Mantle (1800 miles) Outer core (1400 miles) Inner core (750 miles) The core is the innermost zone of the earth. It is mainly iron with some nickel and cobalt. The inner core probably is solid, but the outer core may consist of the same elements in a molten form. The core is the most dense (heaviest) of the three zones.
Kinzua Viaduct
A Switchback
Another American invention is the switchback. By this plan the length of line required to ease the gradient is obtained by running backward and forward in a zigzag course, instead of going straight up the mountain. As a full stop has to be made at the end of every piece of line, there is no danger of the train running away from its brakes. This device was first used among the hills of Pennsylvania over forty years ago, to lower coal cars down into the Nesquehoning Valley. It was afterwards used on the Callao, Lima, and Oroya Railroad in Peru, by American engineers, with extraordinary daring and skill. It was employed to carry the temporary tracks of the Cascade Division of the Northern Pacific Railroad over the "Stampede" Pass, with grades of 297 feet per mile, while a tunnel 9,850 feet long was being driven through the mountains.
Steam Excavator
On the prairies of the West the road-bed is thrown up from ditches on each side, either by men with wheelbarrows and carts, or by means of a ditching-machine, which can move 3,000 yards of earth daily. In this case the track follows immediately after the embankment, and the men live in cars fitted up as boarding-shanties, and moved forward as fast as required.
Wire Railway at the Harwood Coal mines, British Colombia
A novelty in the way of carrying coal may be seen at the Harewood coal mine, at Nanaimo, British Columbia. The mines are situated at a considerable elevation above the sea-level, and the intermediate ground is covered with trees and rocks, while several deep ravines intercept the grounds. Under such circumstances, the construction of a railway would be costly and require much time, as several viaducts would be required, and the road at some places would have to make considerable curves. The proprietor of the mines therefore decided to avoid all these difficulties, on putting up a wire tramway in a direct line from the mine to the port, by means of which the ravines could be spanned without expense, and the timber on the ground could be converted into the necessary posts. There are in all ninety-seven posts, put up to such a height that the wire spanned over them forms a softly inclining plane. The distance between them is from 150 to 250 feet. The wire rope is of the best crucible steel, specially made for the purpose, and is 6-1/2 miles in length; each post having a pair of groove-pulleys two feet in diameter, over which the wire moves. The rope is driven at the lower end by an engine of 20 horse-power, which is sufficient to drive the line when carrying 12 tons per hour.
A Sharp Curve—Manhattan Elevated Railway, 110th Street, New York
Equally valuable improvements were made in cars, both for passengers and freight. Instead of the four-wheeled English car, which on a rough track dances along on three wheels, we owe to Ross Winans, of Baltimore, the application of a pair of four-wheeled swivelling trucks, one under each end of the car, thus enabling it to accommodate itself to the inequalities of a rough track and to follow its locomotive around the sharpest curves. There are, on our main lines, curves of less than 300 feet radius, while, on the Manhattan Elevated, the largest passenger traffic in the world is conducted around curves of less than 100 feet radius. There are few curves of less than 1,000 feet radius on European railways.
Austin, Nevada, six thousand feet above the sea
Austin, Nevada, six thousand feet above the sea. The metropolis of the Reese river district. Silver first discovered at this point in July, 1862.
Newbridge, County Dublin
Reconstruction of coal-forming swamp
Coal is a combustible rock that was formed by the accumulation and partial decay of vegetation. When coal was forming millions of years ago, most of the state was a low coastal plain bordered on the west and southwest by a shallow sea. A large variety of plants grew in great swamps which covered this coastal plain. When the plants died, they accumulated in the swamps to form thick masses of peat that were eventually covered by shallow seas and buried beneath mud and sand. Periodically, the region was above sea level, new swamps developed, new peat deposits accumulated, and more sediments were laid down. This process occurred repeatedly until over 3,000 feet of sediments had been deposited. Then the sediments were slowly compacted and hardened so that sandstones, shales, limestones, and coals were formed.
Hannah Snell
Who took upon herself the Name of James Gray; and, being deserted by her Husband, put on Mens Apparel, and travelled to Coventry in quest of him, where she enlisted in Col. Guise’s Regiment of Foot, and marched with that Regiment to Carlisle, in the Time of the Rebellion in Scotland; shewing what happened to her in that City, and her Desertion from that Regiment.
Rail Making
Benjamin of Tudela in the Desert of Sahara
This Jew was the son of a rabbi of Tudela, a town in Navarre, and he was called Benjamin of Tudela. It seems probable that the object of his voyage was to make a census of his brother Jews scattered over the surface of the Globe, but whatever may have been his motive, he spent thirteen years, from 1160-1173, exploring nearly all the known world, and his narrative was considered the great authority on this subject up to the sixteenth century.
Newbridge, County Dublin
Erection of a Cantilever
The new bridge at Poughkeepsie has three of these cantilevers, connected by two fixed spans, as shown in the illustration. The fixed spans have horizontal lower chords, and really extend beyond each pier and up the inclined portions, to where the bottom chord of the cantilever is horizontal. At these points the junctions between the spans are made, and arranged in such a way, by means of movable links, that expansion and contraction due to changes of temperature can take place. The fixed spans are 525 feet long. Their upper chord, where the tracks are placed, is 212 feet above water. These spans required stagings to build them upon. These stagings were 220 feet above water, and rested on piles, driven through 60 feet of water and 60 feet of mud, making the whole height of the temporary staging 332 feet, or within 30 feet of the height of Trinity Church steeple, in New York. The[35] time occupied in building one of these stagings and then erecting the steel-work upon it was about four months. The cantilever spans were erected without any stagings at all below, and entirely from the two overhead travelling scaffolds, shown in the engraving. These scaffolds were moved out daily from the place of beginning over the piers, until they met in the centre. The workmen hoisted up the different pieces of steel from a barge in the river below and put them into place, using suspended planks to walk upon. The time saved by this method was so great that one of these spans of 548 feet long was erected in less than four weeks, or one-seventh of the time which would have been required if stagings had been used.
The approach to Constantinople
From Anselmi Banduri Imperium orientale, tome II., p. 448. 2 vols. folio. Parisiis, 1711.
Beginning a Tunnel
Tunnels are neither so long nor so frequent upon American railways as upon those of Europe. The longest are from two to two and a half miles long, except one, the Hoosac, about four miles. Sometimes they are unavoidable. The ridge called Bergen Hill, west of Hoboken, N. J., is a case in point. This is pierced by the tunnels of the West Shore, of the Delaware, Lackawanna, and Western, and of the Erie, the last two of which, are placed at different levels to enable one road to pass over the other. It is by our system of using sharp curves that we avoid tunnels. It may be said, in general terms, that American engineers have shown more skill in avoiding the necessity of tunnels than could possibly be shown in constructing them. When we are obliged to use tunnels, or to make deep cuttings in rocks, our labors are greatly assisted by the use of power-drills worked by compressed air and by the use of high explosives, such as dynamite, giant powder, rend-rock, etc. Rocks can now be removed in less than half the time formerly required, when ordinary blasting-powder was used in hand-drilled holes.
Physiographic provinces of Illinois
Physiography is the study of the creation and gradual change of land surface forms (the landscape). Thus, the land surface as we see it today in each of the physiographic provinces has had a particular history of development. Driftless Area Wisconsinan Moraines Illinoian Till Plain Mississippi River Wabash River Shawnee Hills Ohio River- View of Thomas Pope's Proposed Cantilever (1810)
The most notable invention of latter days in bridge construction is that of the cantilever bridge, which is a system devised to dispense with staging, or false works, where from the great depth, or the swift current, of the river, this would be difficult, or, as in the case of the Niagara River, impossible to make. The first design of which we have any record was that of a bridge planned by Thomas Pope, a ship carpenter of New York, who, in 1810, published a book giving his designs for an arched bridge of timber across the North River at Castle Point, of 2,400 feet span. Mr. Pope called this an arch, but his description clearly shows it to have been what we now call a cantilever. As was the fashion of the day, he indulged in a poetical description: "Like half a Rainbow rising on yon shore, While its twin partner spans the semi o'er, And makes a perfect whole that need not part Till time has furnish'd us a nobler art." 
Woolly mammoth
Scattered mammoth and mastodon remains have been found in glacial deposits at various localities in the state. Peat, which is an accumulation of partially decomposed plant materials, has been found, especially in the northern part of the state. It is marketed as an organic soil conditioner.
Limits of ice age glaciers
In Canada vast thicknesses of snow and ice accumulated until the weight of the ice finally caused it to flow slowly outward, mainly to the south. Rocks and surface materials of all types were picked up and carried by the glaciers for great distances before being deposited. Pieces of granite, quartzite, and native copper among the many local rocks and minerals are found in glacial deposits and indicate that at least part of these deposits came from the Great Lakes Region. The materials deposited range from clay-size minerals to large boulders.
Miners Descending a Shaft
The shaft is frequently called the miners’ tomb; and it is said that the Belgians have intentionally named it The Grave La Fosse). In some mines, so many accidents have occurred in the shaft, that the men never enter it without fear. Great improvements have been made in the mode of ascending or descending, and at the present day the apparatus is considered nearly perfect. The first improvement for the protection of men ascending and descending, was to cover the tubs with a roof, or bonnet, so that falling materials would injure nobody. Besides this, the heads of the men are shielded by hats made of sheet iron or stout leather. An indicator is kept in front of the engine man, so that he knows precisely the position of the tub; and if there are two tubs in the shaft, one ascending and the other descending, he may know when they pass on their way. In some coal mines the tubs or cages are double-decked, and some of them have four tiers or decks.
Extent of the main glacial advances
Extent of the main glacial advances which began with the Nebraskan (a—the oldest) and ended with the late Wisconsinan (f—the youngest). Diagram “d” shows the major stream development during the time between the Illinoian and the earliest Wisconsinan glaciers. The heavy lines on the diagrams indicate major stream valleys that were present during these times. a. Inferred limit of NEBRASKAN glaciation b. Inferred limit of KANSAN glaciation c. ILLINOIAN glacial advance d. SANGAMONIAN major drainage e. Maximum WISCONSINAN glacial advance f. Late WISCONSINAN Valparaiso front and Kankakee Flood
Remains of the Wall
The City was thus protected by a great wall pierced by a few gates, with bastions and towers. At the East End after the Norman Conquest rose the Great White Tower still standing. At the West End was a tower called Montfichet's Tower.
Royal Arms of England from Richard I. to Edward III
(From the wall arcade, south aisle of nave, Westminster Abbey.)- Kinzua Viaduct; Erie Railway.
Valleys and ravines are now crossed by viaducts of iron and steel, of which the Kinzua viaduct, illustrated here, is an example. A branch line from the Erie, connecting that system with valuable coal-fields, strikes the valley of the Kinzua, a small creek, about 15 miles southwest of Bradford, Pa. At the point suitable for crossing, this ravine is about half a mile wide and over 300 feet deep. At first it was proposed to run down and cross the creek at a low level by some of the devices heretofore illustrated in this article. But finally the engineering firm of Clarke, Reeves & Co. agreed to build the viaduct, shown above, for a much less sum than any other method of crossing would have cost. This viaduct was built in four months. It is 305 feet high and about 2,400 feet long. The skeleton piers were first erected by means of their own posts, and afterward the girders were placed by means of a travelling scaffold on the top, projecting over about 80 feet. No staging of any kind was used, nor even ladders, as the men climbed up the diagonal rods of the piers, as a cat will run up a tree.
London before the Spire of St. Paul's was burned; showing the Bridge, Tower, Shipping, &c
City Gates
Let us examine into the history and the course of the Wall of London, if only for the very remarkable facts that the boundary of the City was determined for fifteen hundred years by the erection of this Wall; that for some purposes the course of the Wall still affects the government of London; and that it was only pulled down bit by bit in the course of the last century. You will see by reference to the map what was the course of the Wall. It began, starting from the east where the White Tower now stands. Part of the foundation of the Tower consists of a bastion of the Roman wall. It followed a line nearly north as far as Aldgate. Then it turned in a N.W. direction just north of Camomile Street and Bevis Marks to Bishopsgate. Thence it ran nearly due W., north of the street called London Wall, turning S. at Monkwell Street. At Aldersgate it turned W. until it reached Newgate, where it turned nearly S. again and so to the river, a little east of the present Blackfriars Bridge. It ran, lastly, along the river bank to join its eastern extremity. The river wall had openings or gates at Dowgate and Bishopsgate,{39} and probably at Queen Hithe. The length of the Wall, without counting the river side, was 2 miles and 608 feet. This formidable Wall was originally about 12 feet thick made of rubble and mortar, the latter very hard, and faced with stone. You may know Roman work by the courses of tiles or bricks. They are arranged in double layers about 2 feet apart. The so-called bricks are not in the least like our bricks, being 6 inches long, 12 inches wide and 1½ inch thick. The Wall was 20 feet high, with towers and bastions at intervals about 50 feet high. At first there was no moat or ditch, and it will be understood that in order to protect the City from an attack of barbarians—Picts or Scots—it was enough to close the gates and to man the towers. The invaders had no ladders.
Part of the Roman Wall at Leicester
The Lepers Begging
Leprosy is supposed to have had its origin in Egypt: the laws laid down in the Book of Leviticus for the separation of lepers are stringent and precise: it was believed, partly, no doubt, on account of these statutes in the Book of the Jewish Law, that the disease was brought into Western Europe by the Crusaders; but this was erroneous, because it was in this country before the Crusaders. Thus the Palace of St. James stands upon the site of a lazar house founded before the Conquest for fourteen leprous maidens.
Old London Bridge
Houses were erected in course of time along the Bridge on either side like a street, but with intervals; and along the roadway in the middle were chain posts to protect the passengers. As the Bridge was only 40 feet wide the houses must have been small. But they were built out at the back overhanging the river, and the roadway itself was not intended for carts or wheeled vehicles. Remember that everything was brought to the City on pack horse or pack ass. The table of Tolls sanctioned by King Edward I. makes no mention of cart or waggon at all. Men on horseback and loaded horses can get along with a very narrow road. Perhaps we may allow twelve feet for the road which gives for the houses on either side a depth of 14 feet each.
Chepe in the Fifteenth Century
The streets and lanes of London within the walls were very nearly the same as they are at present, except for the great thoroughfares constructed within the last thirty years. That is to say, when one entered at Lud Gate and passed through Paul's Churchyard, he found himself in the broad street, the market place of the City, known as Chepe.
A Norman Ship
(From the Bayeux Tapestry.)
Early British Pottery
The Tower of London
Of all the prisoners who suffered death at the termination of their captivity in the Tower, there is none whose fate was so cruel as that of Lady Jane Grey. Her story belongs to English history. Recall, when next you visit the Tower, the short and tragic life of this young Queen of a nine days' reign.
Christ's Hospital
Siege of a village by Champlain
In this campaign he employed instruments of warfare which greatly astonished the savages, and easily secured him the victory. For the attack of a village, he constructed a cavalier of wood, which 200 of the most powerful men "carried before this village to within a pike's length, and displayed three arquebusiers well protected from the arrows and stones which might be shot or launched at them." A little later, we see him exploring the river Ottawa, and advancing, in the north of the continent, to within 225 miles of Hudson's Bay. After having fortified Montreal, in 1615, he twice ascended the Ottawa, explored Lake Huron, and arrived by land at Lake Ontario, which he crossed.
Building a Church in the later Style
(From a drawing belonging to the Society of Antiquaries.)
Interior of a Silver mine in Mexico
Rich mines of silver existed in the new world, particularly in Mexico and Peru. The conquest of Mexico by Cortes in 1519 was speedily followed by the development of the rich silver mines of that country. From a very early period the Aztecs had been familiar with silver, and wrought it into many ornamental and useful articles. The mines were opened and extensively worked by the Peruvians in Guanajuato, Zacatecas, and other districts, and their production was greatly increased by the abundance of quicksilver, and its employment in the reduction of ores. Quicksilver is used for this purpose to a greater extent in Mexico and Peru than in other countries.
Tower in the Earlier Style. Church at Earl's Barton
Old St. Paul's on Fire
Indian Burial Ground
Among some of our western tribes of Indians the bodies of the dead are placed on scaffoldings of poles several feet high, and there left to the action of the elements. This practice had its origin in the absence of all tools suitable for digging in the earth, and possibly from a vague theory that the body of the deceased should be raised towards the home of the Great Spirit beyond the skies.
Snow-sheds, Selkirk Mountains, Canadian Pacific
In all countries, old and new, mountainous and level, the rule should be to keep the level of track well above the surface of the ground, in order to insure good drainage and freedom from snow-drifts. The question of avoidance of obstruction by snow is a very serious one upon the Rocky Mountain lines, and they could not be worked without the device of snow-sheds—another purely American invention. There are said to be six miles of staunchly built snow-sheds on the Canadian Pacific and sixty miles on the Central Pacific Railway. The quantity of snow falling is enormous, sometimes amounting to 250,000 cubic yards, weighing over 100,000 tons, in one slide. It is stated by the engineers of the Canadian Pacific, that the force of the air set in motion by these avalanches has mown down large trees, not struck by the snow itself. Their trunks, from one to two feet in diameter, remain, split as if struck by lightning.
Saxon Horsemen
(Harl. MS. 603.)
South-east Part of London in the Fifteenth Century, showing the Tower and Wall
A Sea-Fight
(From the 'Life of Richard Beauchamp, Earl of Warwick'; drawn by John Rous about 1485.)
The Last Span - ready to join
A Citizen and his wife
Ordinary Civil Costume ; temp Charles I (From Speed's map of 'The Kingdom of England,' 1646.)
Martyrdom of St. Edmund by the Danes
(From a drawing belonging to the Society of Antiquaries.)
A Gentleman and gentlewoman
Ordinary Civil Costume ; temp Charles I (From Speed's map of 'The Kingdom of England,' 1646.)
Ordinary Dress of Gentlemen in 1675
(From Loggan's 'Oxonia Illustrata.')
Lay Costumes in the Twelfth Century
Temple Bar, London
(Built by Sir Christopher Wren in 1670; taken down in 1878 and since rebuilt at Waltham Cross.)
Costume of a Lawyer
(From a broadside, dated 1623.)
Roman London
Civil Costume about 1620
(From a contemporary broadside.)
Washington before the revolution
Washington before the revolution