The first unit became operational in February 1939 . These 16.5 ton anti-aircraft mountings had a maximum elevation angle of 80 degrees.
42.
The gun could be loaded on any elevation angle, but the rate of fire was reduced on elevations higher than + 25?
43.
The trunnions are also at the very rear of the breech; this maximises the recoil space when firing at higher elevation angles.
44.
The steep 44-degree angle from the outcrop to the lake's mirrorlike surface provided a wide range of elevation angles for GPS readings.
45.
The literature is rife with horizontal decoders based on the simpler cylindrical harmonics, which do not depend on the elevation angle \ phi.
46.
This is in contrast to projectile drop which is referenced to the plane containing the line of departure regardless of the elevation angle.
47.
The centre section of the upper shield both slides up and down and folds to accommodate the barrel at higher elevation angles of fire.
48.
The centre section of the upper shield slides both up and down and folds to accommodate the barrel at higher elevation angles of fire.
49.
The first was the need for an adjustable quick firing recoil system to prevent the breech striking the ground when fired at high elevation angles.
50.
One instruction sheet found on the ground was an " abridged firing table " for the mortars, giving information on elevation angles for different ranges.
