402 
7 C ITALIAN FIELD GUN. 
the mean of the dimensions taken as the extreme length of the axle. 
It is very closely 1 ft. less than that in the English service. If the 
principle of having as short a pipe-box as possible, consistent with the 
construction of a strong wheel with metal nave, be adopted in connec¬ 
tion with the above detailed hollow of axle-arm and dish of wheel, 
the width of track naturally follows. 
In the 7 C gun-carriage, an equilateral triangle constructed on a base 
of the distance between the outsides of the tires as they rest on the 
ground, gives the height of the centre of gravity of the gun and 
carriage combined. Thus the upsetting angle is over 60°. 
Eo.vte, 
February, 1876. 
