474 
FIRING AT MOVING OBJECTS. 
the smoke of the burst (at 1400 yards a burst 60 yards short would be 
six feet high). This method would, however, be much facilitated by 
the addition to shrapnel of some substance giving a dense smoke on 
ignition, possibly in the head of a shrapnel with burster in the base, 
or in place of the resin used in fixing the bullets. 
The above system is practically the same as the first method given in 
the Field Artillery drill-book of 1889, but so far as I know it has never 
been worked out in detail or tried at practice. 
