410 
LAYING GUNS BY TELESCOPE. 
sents the front end of the rest with the spring underneath, which is 
passed through the orifice in the “ Broca ” fore-sight (Fig. 3), when 
the instrument is placed on the gun. 
Fig. 2 shows rear and side elevation of the other end of the rest. 
The upper recess, in the form of a truncated \/, holds the telescope, 
while the lower side is shaped in a similar manner so as to keep it 
steadily in position on the head of the tangent-scale. 
Fig. 2. 
Fig. 4 shows the eye-piece of the tangent-scale. 
Laying with When the gun is correctly laid, the object is seen through the eye- 
the ordinary i n Fig. 4, at the point P, between the horns of the “ Broca ” 
fore-sight (Fig. 3). 
Laying with In laying with the telescopic apparatus, of course, it is only necessary 
the tele- ‘ ' , ’ 1 * j1 ' jp* - c xi_<_ x. 
scope. 
to bring the cross-wires on the centre of the object. 
Kingstown, 
20th. October, 1880. 
