A preliminary examination of the German 75-mm Geb. G.36 (mountain gun)
as been made and the following information obtained.
|Caliber|| ||75-mm |
|Length of barrel and breech ring ||69.2 in|
|Length of barrel ||58.0 in |
|Overall length of muzzle brake ||12.32 in|
|Length of rifling ||50.96 in|
|Rifling||Right hand polygroove|
|Number of grooves ||28|
|Twist of rifling ||1 in 24 uniform|
|Weight of barrel||233.2 lbs|
|Weight of barrel with breech ring top plate and breech mechanism ||583 lbs|
|Weight of breech mechanism ||68.2|
|Traverse||15° approx right and left|
b. The Gun
Monobloc barrel fitted with perforated muzzle brake. The rear end of the
piece is rectangular and fits into prepared recesses in the breech ring from which
it is readily detachable. At the forward end is a binding ring with a lug which fits
into a hook mounted on the cradle. A counterweight, weighing 114.4 pounds, is
mounted on top of the breech ring. The breech block is of the horizontal sliding
block type, opening to the right.
c. The Carriage
The saddle is shaped like a U lying sideways, prongs forward, and swings
under the crosshead, being pivoted centrally. The trunnion bearings are at the
extreme rear. The trunnion caps are secured by spring plungers. Traverse
stops are fitted at the lower right and left rear.
The cradle is trough-shaped. A guideway extends the whole length on
which a hook is mounted at the front, and at the rear, a rectangular surface to
receive the forward end of the piece and breech ring respectively. A recoil
indicator is fitted to the right side reading from 600 to 770, and inscribed
Achtung Feuerpause 1244 (safety limit of recoil 1244 mm).
A compensator is fitted and consists of a spring-loaded cylinder situated
inside the saddle. It is anchored at the forward end to the base of the saddle, and
at the other end to the base of the cradle.
The crosshead consists of a rectangular shaft at each end of which are
bearings to receive the trail heads. It is pivoted centrally in the vertical plane
to the axle and swings in slides secured to the axle at each end.
The axle is a simple straight rectangular shaft tapered at each end for the
wheels. The wheels may be detached by lifting spring plungers which are situated
at each end on top of the shaft.
The split trail consists of two hollow rectangular girders, prepared at the
rear to receive spades, and mounted at the forward end in the bearings on the
crosshead. Spring loaded plungers on top of the trail heads lock the trails in
position when open. In the closed position they are locked by an arm attached to
the rear of the left leg which is clamped to an attachment on the right leg by means
of a rotating bolt. Two screw stops are mounted on the trail legs; when unscrewed
these permit of approximately 2 degrees of traverse either way with the trail legs
closed. The trail legs may be detached from the trail heads, on which they are
normally locked, by means of a lever catch.
The elevating gear, on the right hand side, consists of a handwheel, universal
joint, and two pinions, one of which engages with the elevating arc which is
secured to the right of the cradle.
The traversing gear, on the left hand side, consists of a nut and screw device.
The nut is enclosed in a cylinder attached at one end to the rear of the saddle,
while the screw shaft is secured to the crosshead.
The recoil mechanism -- buffer and recuperator cylinders lie inside the
cradle to the right and left respectively.
The sight bracket consists of a pillar secured to the left rear of the saddle
with a trunnion at the top on which the sighting gear is mounted.