212 
MINUTES OP PEOCEEDINGS OP 
In like manner by substituting the values of x and y of Equations III. in 
Equations l a , we shall get values of X and Y for obtaining the centre of 
gravity of an equirotal carriage such as those in use in the Artillery 
Service. 
The above experiment was made with a view to getting data for the 
calculation of the strain on the axle of a carriage when the piece is fired. 
In this calculation I failed, owing to the difficulty of comparing impact with 
pressure. I commend the problem to the notice of better mathematicians. 
