THE COAST ARTILLERY JOURNAL - Air Defense Artillery

218 THE COAST ARTILLERY JOURNAL
marked. One of the other arms has a pointer (2) attached to it to read
azimuths from the base plate. The outer rim of the base plate is graduated to
ten mils.
(3) The standard used for supporting the telescope is attached to the
arms previously described. The telescope is attached to this standard by trunnions
and an elevating hand screw mounted on these trunnions works through
a worm screw to the elevating rack on the under side of the telescope.
(4) The angular-height pointer is also attached to the trunnions and
the scale to the telescope. The pointer is adjustable.
(5) The telescope is a two-power instrument having both 10 and 25power
magnification through two different eyepieces, either of which can be
brought into use by a lever on the rear of the telescope.
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c. The added equipment consists of cross.bar, with clamp with which to
fasten it to the telescope, and a model 1917 gun sight mounted at each end of
this bar.
(1) The cross-bar is made of U-section iron or steel, tapered at the
ends and having holes bored in the web to lighten it. The center is cut away to
fit the telescope and the clamp, consisting of a U-shaped rod with threaded
ends, is brought through holes in the top where washers and nuts are screwed
on, thus clamping the bar tightly to the telescope.
(2) At each end of the bar is attached a device which may be either
of the design as shown in Figure 1 or as shown in Figure 2. In Figure 1 the
method used is by means of set screws clamping metal blocks to pins, one pin
attached to the gun sight by a band clamp, and running through a hole drilled
in the outer block (8). By loosening the set screw in this block the sight can