138 
AUTOMATIC SIGHTING-. 
such guns alone can perform the functions for which coast guns are 
intended. 
For those who still doubt the wisdom of applying automatic sights 
at once to all our guns (mounted at suitable heights) which are worth 
it, it may be noted that the service automatic sights are convertible 
into ordinary tangent sights, by a turn of a lever, in a second or two. 
They are then available for use with range-finders for laying in the 
ordinary way if desired. I do not believe, however, that this lever 
will have much work thrown on it. 
There is, of course, one class of guns—high angle fire guns—to 
which automatic sights are useless. To these the position-finder is a 
necessity. 
