Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

575 OF ENGINEERING FORMULÆ Gukneey, &c. (by Capt. Bridges, li.A.)— continued. Impact of Shot. W = Weight of projectile. v = Velocity at point of impact. I = Force of impact in Iba. I = *0155 We2. Point-blank Ranges, &c. SERVICE CHABGES. Iron G uns, f rom 300 to 400 yards. Add 100 yards for each up to 1300 yards. „ 50 „ 2500 „ Rather less for the lighter 32-pounders. For GS-poundera and 112 ewt., 1-10 and 70 yards respectively. Bronze Guns, P. B. 280 to 340 yards. C-poundei add 70 yds. for each. to 1000 yds. 9 „ 80 ,, „ 12-pr. howitzer 50 „ „ 24 „ 60 „ „ Service Charges. Iron S. B............' • • i weight of shot. Bronze 9-pr. and 6-pr. .. | „ „ B. L. rifled guns .. .. | „ M. L. R. 150-pounder, 40 lbs. i 68-ppuiiders. „ !00 » 25 „ I n2 cwt. 18 lbs. ” “ :: J»;; 195 ••16 ”