« 2020
2022 »
January
February
March
April
May
June
July
August
September
October
November
December
All
- Field Artillery
- 36-inch searchlight and controller
- 5 inch R.F. gun and breech mechanism
- An assembled mine
- Block swings free to right of gun
- Breech in normal position—closed
- Frankford arsenal 21-second combination fuse
- Frankford arsenal centrifugal fuses
- 36-inch searchlight and controller
- Frankford arsenal time percussion or combination fuse - Model 1900
- boat-telephone
- rotating crank-catch turned 90°
- the block released