406 
MINUTES OF PROCEEDINGS OF 
The same sectograph will solve a problem of the second class on any 
map, no matter to what scale it is drawn. 
This scale is extremely useful in determining “ dead ground ” in the 
adaptation of works to contoured sites, and for finding whether two 
hostile parties are in view of each other at Kriegs-spiel. An instru¬ 
ment on the same principle as the cardboard sectograph is now being 
constructed for use with the War Grame, as it is feared that the 
laying down of a large piece of cardboard on the maps might interfere 
with the blocks representing the troops. It is intended to submit 
this instrument, when complete, for the approval of the Kriegs-spiel 
Committee. 
Whitehall, 
March 10, 1874. 
