July-August - Air Defense Artillery School

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or grey cast iron block, 5" x 8" x 13~~". which sen'es the
purpose of a counterweight (see Figures 1 and 4). and (2)
a steel casting whose end cross section resembles an inverted
letter "U" and which is approximately 20:}l;" long with part
of the sides cut away near one end (see Figures 2 and 4).
The block is bolted to the bottom of this second. or top.
casting and brackets to hold the machine gun are bolted to
its upper surface. The studs from the heavy block are inserted
into slots in the top casting so as to permit adjustment.
In turn studs in the upper surface of the top casting
fit into slots in the front and rear machine gun mounting
brackets to allow for small adjustments while fitting on the
gun, and preliminary rough alignment. Figure 3 shows
the drawings for m~king the mounting brackets and Figure
4, among other things, pictures the brackets and necessary
bolts. The sides of the top casting are tapped at the proper
places so that it may be firmly bolted to the 40mm gun
casing by means of bolts through the holes that normally
contain the automatic loader retaining screws. Figure 5
shows the whole adopter ready to be fitted into the 40mm
gun and Figure 6 shows it in place with a machine gun
attached and ready for firing.
1\ IOllC\TING TIlE ADOPTER
To affix this mount it is necessary only to remove the
automatic loader from the gun anel' inse;t the mount in
OJ HE COAST ARTILLERY JOLlR.'\AL
Materiel Cost Steel
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