RANGING BY CLINOMETER. 489 
for both Scott’s sights! and clinometers, sometimes even to the extent 
of sending them by rail to practice camps instead of trusting them to 
the limbers on the line of march, and even thea the results obtained by 
clinometers were not satisfactory. 
It has been evident for some time that we want a new clinometer and 
different patterns have been experimentally tried, and of these the 
German pattern seems to have been the most favourably reported on. 
It has, however, an adjustable zero, the disadvantage of which has been 
touched on; but the adjustability is not an essential part of the design 
and could easily be left out. 
This instrument is said to stand the jolting and rough usage 
inseparable from service conditions and so does away with objections 
(2), (4) and (5) to the service clinometer, while the Scott’s sight, used 
as a level, does away with objections (1) and (3). 
If, therefore, a curve with sliding level, could be attached to the 
trunnions of a Scott’s sight so that it would fit into the slots on the 
Scott’s sight bracket, objections (1), (2), (3), (4) and (5) would be done 
away with, whilst objection (6) could be easily got over by a simple 
device to be described further on. 
We should then have an accurate clinometer having an open scale 
and some means of showing the position of the bubble to the gun-layer, 
fitted with a cross level and trunnions to go into the bracket of the 
Scott’s sights; and if such a design would stand service conditions, it 
is probable that all the objections mentioned would be met. 
I beg to submit herewith a design for such a combination. 
_ Figure I. is a side view of the clinometer showing it resting in the 
Scott’s sight bracket. The trunnions on the far side are indicated by 
dotted lines. 
The principle is the same as that of the German pattern, viz., a 
spirit-level sliding along an undercut curve, only in this case the slide 
is fixed to the side of the curve instead of on the top, and there is no 
adjustable zero to measure the angle of sight. 
Such an adjustment could, however, be easily added if considered 
desirable. 
The slide containing the level is moved along the curve by means of 
a thumb wheel and ratchet, whichis shown in section in Figure V. 
Figure IT. shows an end on view of the clinometer looking from the 
gun-layers position, the position of the bubble is made visible by means 
of a prism. 
Figure VIII. gives a lateral, and Figure IV. a cross section through 
both level and prism. ; 
Figure III. gives a view of the instrument louking down on it, 
showing the trunnions and the cross level. 
Figure VII. shows the method of attachment of the trunnion to the 
curve. 
Figure VI. gives a section through the cross level. 
1 N.B.—No reflection whatever is intended cn the Scott’s sight, which has done admirable 
service as a sight and would no doubt do further good service as a clinometer if not spoilt by the 
addition of what has been proved to be unreliable complications, viz : Drum reading and an ad- 
justable zero. But, if there is a doubt .asto whether telescopic sights will stand much travelling 
on the limbers, how much more doubt must there be when they are still further complicated. 
66 
