A US Army report on anti-aircraft guns of April 1917 reported that this gun's semi-automatic loading system was discontinued because of difficulties of operation at higher angles of elevation, and replaced by " the standard Vickers-type straight-pull breech mechanism ", reducing rate of fire from 22 to 20 rds / minute.
42.
Altitude data from that point forward came from the U . S . Air Force, which has radars in Riverhead, on eastern Long Island, and Truro, on Cape Cod, that can estimate the altitude of incoming objects by recording the angle of elevation of the radar when the signal hit the object.
43.
Find the rate at which the angle of elevation is changing when the angle is 30 o " I realize trigonometry is necessary here, but I still can't figure out a way to solve it without knowing either the plane's distance from the observer or the horizontal distance between the observer and the plane.
44.
Meeting together three months later, students and teacher still chuckled about obscure references to " Jenny's closet of numbers " ( a term they invented to help visualize different kinds of infinities ) or " an ant of negligible height " ( which they used when describing an angle of elevation viewed from ground level ).
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