THE ROYAL ARTILLERY INSTITUTION. 
339 
In the transport heavy spring wagon (made by contract), which has 
second class wheels and axles and takes a load of 2 tons, in a hind 
spring we have 
s = 43i" 
b = 2J" 
*=i" 
n = 10 qrt 
~ x (4) 3 x 10 
Therefore the working strength of the spring = ' 4 gi' ;; x 11 3 
= *73 ton, or ton; while, supposing the distribution of the load 
over the axles to be in the proportion of 1 on the fore axle to 2 on the 
hind, the actual load upon the spring = \ of 1J tons = § ton, or -Jgg ton. 
(¥)Vi05 
Also, for the same spring, the deflection per ton of load = --— 
j x (4) 3 x 10 
= 6 ,, *002 ; or for the actual load of § ton upon the spring = § x 6*002 
= 4"*001, which exceeds by 0"*626 half the amount of deflection 
required to bring the spring straight—which latter, as already men¬ 
tioned, ought not to be exceeded. 
