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Diagram VI
Diagram of Japanese Machine Gun—Tripod Mount.
a-b Front and Rear Sights
A Piston rod
m Gas Vent.
e Gas chamber.
d Regulating nut.
e Strong spiral spring.
s Feed Slot
R Radiator
piston and not by the direct force of recoil as
in the Maxim. It uses the same ammunition
as the infantry rifle (murata calibre ·26), and is
rated as firing 600 rounds a minute. Two
forms of mountings are employed, the tripod
and the wheeled; the former for fortress use,
and the latter for mobile troops. Referring to
the plate, a gas vent m communicates with a
gas chamber c attached laterally to the barrel.
The pressure in the gas chamber is regulated,
within limits, by the nut d, which varies the
capacity of the chamber. The piston-rod A is
acted upon by the gas pressure at its forward
end, and is driven to the rear against a strong
spiral spring o, which moves the piston end
forward after the gas pressure has ceased to
act. The reciprocating motion of the piston-rod
actuates the mechanism, which is entirely
enclosed in the housing, and performs the
various operations of feeding, firing, and ejecting
through a suitable train of gearing. Cooling is
effected by the radiator R, a circumferentially
