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The MK 1 is a time-fused fragmentation grenade and has 32 serrations on it. To start the fuse, the user has to pull the safety pin, then push off the cap on top of the grenade. Right before throwing, the user has to move the switch on the lever away from the grenade in order to start the fuse.
The Mod 1 probably featured an improved type fuze, moving away from the simple wick lighter design. The Mod 2 featured a simplified overall design, while the Mod 3 replaced the single-piece steel body with a two-piece plastic shell.
Mark 1A Computer Mk 37 Director above the bridge of destroyer USS Cassin Young with AN/SPG-25 radar antenna. The Mark 1, and later the Mark 1A, Fire Control Computer was a component of the Mark 37 Gun Fire Control System deployed by the United States Navy during World War II and up to 1991 and possibly later.
T2AAP = 3,600 Cartridges, .45 ACP Ball M1911, in 50-round Cartons, 12 cartons per M5 Ammo Can, 3 M5 Ammo Cans per rectangular cardboard box, 2 horizontally-stacked cardboard boxes per metal 20mm Mk.1 Mod.0 ammo box. Used by the Navy and Marine Corps starting in 1943 to replace the small and large M1917 wooden packing boxes.
The Mk 7 Mods 3, 4, and 6 bomb dispensers have the Mk 339 Mod 1 fuze, which provides the pilot with in-flight selection of the fuze function time. The Mk 7 Mod 4 bomb dispenser differs from the Mk 7 Mod 3 by modifying the dispenser and giving interface capabilities with a wider range of military aircraft.
Figure 1: The Ford Mk 1 Ballistic Computer. The name "rangekeeper" began to become inadequate to describe the increasingly complicated functions of rangekeeper. The Mk 1 Ballistic Computer was the first rangekeeper that was referred to as a computer. Note the three pistol grips in the foreground, which are the firing keys of the main guns.
The missile contains a 1.4-kilogram (3.1 lb) warhead with a contact fuze and a single-stage solid-rocket motor that accelerates the missile to about 650 metres per second (2,100 ft/s), about Mach 2. Engagement time to the maximum effective range is about 13 seconds.
[2] 200 Mk 17s and 105 Mk 24s were produced, all between October 1954 and November 1955. The Mark 17 and Mark 24 were identical in all respects save for the design of their primary section. [ 2 ] They were the largest nuclear weapons ever put into service by the United States; only the Convair B-36 Peacemaker was capable of carrying them.