THE LE BOULENGE TELEMETER. 
171 
In tlie summer of last year tlie Russians made some experiments with 
the Le Boulenge telemeter, and they considered that the results then 
obtained warranted a more searching trial of the instrument. They 
therefore selected two officers of the battalion of rifles of Field Marshal 
Prince Bariatinsky to conduct the experiments. 
Ten shots were fired at each range, and the mean was taken of the 
results at these ranges. The following table shows the results obtained 
by each officer 
Measured 
distance in 
Distance estimated by 
telemeter. 
Mean distance 
estimated by 
paces.^ 
1st observer. 
2nd observer. 
two observers. 
600 
570 
600 
585 
800 
763 
780 
771 
1000 
999 
977 
988 
1200 
1179 
1180 
1180 
911f 
909 
913 
911 
* The Russian pace is equivalent to 0'7 metres, or 2 ft. 3'5ins. 
+ This distance of 911 paces was taken at random, and not measured until after the observations were 
taken. 
Tlie “ Invalide Russe ” says that from the above table it appeared 
that, out of 100 ranges taken, 74 indicated the distance within the 
limits of the line of demarcation, 21 within the limits of its radius, and 
only 5 without that limit. 
The Brussels paper explains that probably the limit of the distances 
corresponding to each degree of the sight is that designated as the 
“ limit of the line of demarcation,” and consequently all the distances 
within this limit or its radius make up an exact graduation of the sight. 
We must remember that these experiments were made by men who 
did not know the instrument, and that only blank cartridge was used 
for the shots; the report, therefore, was not so prononce as when 
using service charges and projectiles. 
In the other experiments the soldiers adjusted their sights by the 
distances given by the telemeter, after having acquired confidence from 
its good results. When even the distances could be guessed by eye, 
the soldier did not always adjust the sight according to his estimate of 
the range, but preferred to take that given by the telemeter. 
The other experiments were made in the following manner 
Two guns were placed in position with their detachments, consisting 
of 1 officer, 2 gunners, and 12 men, representing the enemy. The 
detachment (formed of dummies) were so arranged that 1 ball could 
not penetrate more than 2 dummies. 
The company of the regiment above-named, consisting of 48 files, 
with 10 N.C. officers, was taken away to an unmeasured distance until 
the artillery opened fire. This was done by 2 riflemen left with the 
guns, who fired each a shot and then retired quickly under cover. 
Profiting by these shots, the officer commanding the company measured 
