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The week of 7 May, Schwoebel asked Miceli to conduct drop tests at Dahlgren using five actual bags of powder compressed into a steel cylinder of the same diameter as a 16-inch gun. Miceli responded that Cooper's finding "has no relation to actual 16-inch gun conditions" and refused repeated requests from Sandia to conduct the tests. [96]
This originated the 16-inch M1920 howitzer, 25 calibers long. The high-angle M1920 barbette carriage was designed to allow plunging fire with an elevation of 65 degrees. A similar carriage was also developed for the 16-inch gun M1919 , 50 calibers long, with the same elevation and for the same reason.
The U.S. Navy had the 16"/50-caliber Mark 2 guns left over from the canceled Lexington-class battlecruisers and South Dakota-class battleships of the early 1920s. However it was already apparent that the Mark 2 was too heavy to arm the North Carolina and new South Dakota (1939) battleship classes which had to adhere to the 35,000 ton standard displacement set by the Second London Naval Treaty.
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The most common machine is the impact riveter and the most common use of semi-tubular rivets is in lighting, brakes, ladders, binders, HVAC duct-work, mechanical products, and electronics. They are offered from 1/16-inch (1.6 mm) to 3/8-inch (9.5 mm) in diameter (other sizes are considered highly special) and can be up to 8 inches (203 mm) long.
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