- boat-telephone
- 36-inch searchlight and controller
- the block released
- Frankford arsenal time percussion or combination fuse - Model 1900
- 5 inch R.F. gun and breech mechanism
- Frankford arsenal 21-second combination fuse
- rotating crank-catch turned 90°
- An assembled mine
- 36-inch searchlight and controller
- Breech in normal position—closed
- Block swings free to right of gun
- Frankford arsenal centrifugal fuses
- Ruth and Naomi