Portuguese Voyages and Possessions
The first great navigational feat that followed the invention of the compass was that performed by the Portuguese, Bartholomew Dias, who conceived the idea of reaching India by going around Africa, and sailed down the west coast of Africa as far as its southern end, later called the Cape of Good Hope. It was a tremendous undertaking, and it had tremendous results; for it demonstrated the possibilities of great ocean voyages, proved that the road to India was very long, and led to the expedition of Columbus, six years later. It was also a great invention, both in brilliancy of conception and excellence of execution, although Dias did not reach India. The second great navigational feat was performed by Christopher Columbus in 1492. Before that time it was conceded by most men of learning and reflection that the earth was spherical; and it was realized that, if it was spherical, it might be possible by sailing to the westward to reach India, the goal of all commercial expeditions in that day. Columbus is not to be credited with the first conception of that possibility.
Hero's Engines
One of the early influences of the art of printing was to bring to the notice of some restless minds the writings of Hero and Archimedes. In Hero's Pneumatics, published more than 120 years before Christ, he gives such a clear account of an invention of his own, in which the expansive force of steam was used to give and maintain motion, as to establish thoroughly his right to the basic invention of the steam engine. He described three apparatus that he devised. In one, the currents of air and aqueous vapor rising through a tube from a hollow sphere, containing water, under which a fire is burning, support a ball placed immediately above the tube, and make it seem to dance. In another apparatus, a hollow sphere into which steam has arisen from what we now call a boiler, is supported on a horizontal or vertical axis, and provided with tubes that protrude from the sphere, and are bent at right angles to the radius and also to the pivot. The inner ends of these tubes lie within the sphere, so that the steam passes from the sphere through the tubes. As soon as this happens, the sphere takes up a rapid rotation, that continue so long as the steam continues to escape from the nozzles of the tubes, which point rearwardly. A third apparatus was merely an elaboration of the second, in that the sphere was connected with an altar which supported a large drum on which were figures representing human beings. The fire being lighted, the sphere would soon begin to revolve, and with it the drum; and the figures on it would seem to dance around, above the altar. The invention was probably to impress the people with the idea that the priests were exerting supernatural power.
Hero's Altar Engine
A third apparatus [from Hero] was merely an elaboration of the second, in that the sphere was connected with an altar which supported a large drum on which were figures representing human beings. The fire being lighted, the sphere would soon begin to revolve, and with it the drum; and the figures on it would seem to dance around, above the altar. The invention was probably to impress the people with the idea that the priests were exerting supernatural power.
Leupold's Engine
In 1725, Jacob Leupold invented an engine, in which the work was done by steam alone, instead of by the atmosphere, as in the engines that immediately preceded it. Leupold used two cylinders. They were open at the top to the atmosphere as in the others, but154 he used higher pressures of steam, and arranged a four-way cock between the bottoms of the two cylinders in such a way that the bottom of each cylinder, in its turn, was connected to the boiler or to the open air. Each cylinder actuated directly a separate vibrating beam, which in turn actuated the piston of a pump; the two pistons acting reciprocally, each drawing up water in its turn. In 1765, James Watt made the very great improvement of providing a condenser separate from the cylinder of the engine, so that the great loss of heat caused by cooling the cylinder and then heating it at each stroke was wholly avoided. He covered the cylinder entirely, and surrounded it with an external cylinder kept always full of steam, that maintained the cylinder at a high temperature. The steam, instead of being condensed within the cylinder, after it had done its work, was allowed to escape into the condenser. To facilitate this action, the condenser was fitted with an air-pump that maintained a good vacuum in it. In 1769, Watt invented an improvement that consisted mainly of means whereby the supply of steam to the cylinder could be shut off at any desired part of the stroke, and the steam allowed to complete the rest of the stroke by virtue of its expansive force. This invention increased tremendously the efficiency of the engine: that is, the amount of work done with a given amount of steam.
The Printing of Books
Now, Gutenberg "worked" his invention so energetically that, with the assistance of Faust, Schaeffer and others, an exceedingly efficient system of printing books was in practical operation as early as 1455. The types were of metal, and were cast from a matrix that had been stamped out by a steel punch, and could therefore be so accurately fashioned that the type had a beautiful sharpness and finish. In addition, certain mechanical apparatus of a simple kind (printing presses) were invented, whereby the type could be satisfactorily handled, and impressions could be taken from them with accuracy and quickness. News of the invention spread so rapidly that before the year 1500 printing presses were at work in every country of Europe. The first books printed were, of course, the works of the ancient authors, beginning with three editions of Donatus. These were multiplied in great numbers, and gave the first effective impulse to the spread of civilization from the Græco-Oriental countries, where it had been sleeping, to the hungry intellects of Europe.
Triumphal Procession from the Arch of Titus
The Lighthouse of the Harbor of Alexandria in the Hellenistic Age
Alexander died in Babylon when not quite thirty-three years old. In actual and immediate achievement he surpassed perhaps every other man who has ever lived. He founded an empire which he himself had conceived and developed, which covered nearly all the then known world, and which, though it was composed mainly of barbarous and semi-barbarous people, was dominated by Greek thought. It is true that the empire fell apart almost immediately after Alexander died. But it did not fall into anarchy, or revert to its previous state: it was divided into four parts, each of which was distinct, self-governing and well organized. The two larger parts, the kingdom of the Seleucidæ, which occupied approximately the territory of Persia, and the kingdom of the Ptolomies, or Egypt, continued as torch-bearers to civilization for many centuries thereafter. Of the two, the former was the larger and was probably the better, from an administrative point of view; but Egypt represented the finer civilization; for Alexandria, with its library and its wonderful museum, became the seat of learning and the resort of the scholars of the world, and the centre of the Hellenistic civilization that followed that of Greece.
Insurgent Captives Brought Before Darius
The Greeks were not naturally of a warlike disposition, and their peculiarly jealous temperament prevented the various states and cities from combining and forming a great nation. Their energetic character and great intellectuality saved them, however, when Darius, King of Persia, invaded Greece in 490 B. C. By that time the Greeks had raised and trained an army of great excellence. No especial inventiveness seems to have been exercised, but the equipments of the men, their organization, their armor, their weapons and their discipline had been brought to a standard exceedingly high. All these advantages were needed; for the Persians were a warlike people, their King Darius was an ambitious and successful conqueror, and the number of Persians that invaded Greece was far greater than the number that Greece could raise to fight them. Had the Greeks been destitute of invention they would have followed the most obvious course, that of shutting themselves up inside the protection of the walls of Athens. Had they done this, the Persians would have surrounded the city, shut them off from supplies from outside, and slowly but surely forced them to surrender.
Two Cretan Vases
We must realize, of course, that the Greeks were much indebted to the Ægeans; for discoveries about the shores and islands of the Ægean Sea show that long before the advent of the Greeks they used tools and weapons of rough and then of polished stone, and later of copper and tin and bronze; that they lived on farms and in villages and cities, and were governed by monarchs who dwelt in palaces adorned with paintings and fine carvings, and filled with court gentlemen and ladies who wore jewelry and fine clothing. Exquisite pottery was used, decorated with taste and skill; ivory was carved and gems were engraved, and articles were made of silver and bronze and gold. As early as the sixth century B. C., the Greeks made things more beautiful than had ever been made before. One almost feels like saying that the Greeks invented beauty. Such a declaration would be absurd of course: but it seems to be a fact that the Greeks had a conception of beauty that was wholly original with them, and that was not only finer than that which any other people had ever had before, but finer than any other people have had since.
Assyrians Flaying Prisoners Alive
The Assyrians used these inventions in their wars against the contiguous nations of the East, and with their aid achieved the mastery, and unified the Orient. That the Assyrian rule was harsh and cruel should not be denied; but, on the principle that any kind of government is better than no government, it cannot reasonably be supposed that the central and efficient administration of Assyria was not better than the condition of continual petty wars and quarrels that had existed among the numerous tribes and nations, with their enormous possibilities for suffering of all kinds.
The Pyramids of Gizeh
Villa of an Egyptian Noble
The Egyptians excelled in architecture, and the greatest of their buildings were the pyramids. As to whether or not there was much invention devoted to those works, it is virtually impossible now to know. The probability seems to be that they could not have been produced without the promptings of the inventor, but that the progress was a slow and gradual march. It seems that there was a long series of many small inventions that made short steps, and not a few basic inventions that proceeded by great leaps.
Carvings
Carvings in Ivory (1 and 3–7) and in Stone of Cavern Walls (2), made by the Hunters of the Middle Stone Age