TRACT 34.

IN GUNNERY.

5

proportion of the recoil, with the different charges, without- balls, is as follows :

2 oz 4 oz 8 oz

56 122 252

the recoils being rather in a higher proportion than thecharge of powder.

If we compare the mean of the first 4, with 2 oz of pow-der and 478 lb weight of gun, with the mean of July 21,with 4 oz of powder and 917 lb weight of gun, we shallobtain as follows :

Charge - - - 2 oz 4 oz

Weight of gun 478 lb - - 917 lb

Recoil - - - 56 - 57

So that, in this instance, the less charge gives a recoil,in proportion to the greater charge, a little above the directratio of the w'eight of powder, and inverse ratio of theweight of the gun. For that ratio, or 2 x 917 to 4 x 478,is as 56 to 58.

If we compare n° 5 with the mean of July ti, which areboth with 4 oz of powder, they will stand thus :

Weight of gun 478 - - 915Recoil - - 122 - - 57

which shows that, in this instance, the same charge givesmore than double the recoil to half the weight of the gun.

Lastly, if we compare the means of each pair of velo-cities with the several weights of gun, we shall have asfollows :

1303 ^ 1308 mean 4,78 lb wt of gun

isb*™ - - “o —

!s“} 1305 - - - - -

which differences are neither regular, nor greater than whathappen from different trials, with the weight and all othercircumstances the same.