(V.) Copy of a letter from the Secretary of War, to the Secretary of the Treasury, dated May 6th, 1794. Sir, I HAVE the honour to transmit you the general dimensions of the heavy cannon which are required for the fortifications and for the frigates ; the proof which will be required of each piece, by persons who shall be appointed by me for that purpose, and the time within which they ought to be delivered. The Cannon for the Fortifications. 32 pounders. The length from the hind part of the base ring to the extremity of the muzzle, - - - - - - - - 9 6 — Diameter of the caliber, - - - - - - - 6 42 External diameter of the breach at the vent or touch hole, - 1 9 8 At the first reinforced ring, - - - - - - 1 7 46 At the trunnions, - - - - - - - 1 5 — Behind and before the muzzle ring, and at the extremity of the muzzle mouldings, - - - - - - - 1 4 15 Thickness of the metal—In the direction of the vent or touch hole, and also from the rear of the caliber, and in the direction thereof to the extremity of the base ring, - - - - - 1 4 — At the first reinforced ring, - - - - - - — — — At the trunnions, - - - - - - - — — — Behind and before the muzzle rings, and at the extremity of the muzzle mouldings, - - - - - - - 3 — 43 The total weight of this cannon estimated at fifty-five hundred. 24 pounders. The length from the hind part of the base ring to the extremity of the muzzle, - - - - - - - - 9 1 — Diameter of the caliber, - - - - - - - — — — External diameter of the breach at the vent or touch hole, - 1 7 35 At the extremity of the second reinforce before the trunnions 1 5 — Behind and before the muzzle ring, and at the extremity of the muzzle mouldings, - - - - - - - — — — Thickness of the metal—In the direction of the vent or touch hole, and also from the rear of the caliber, and in the direction thereof to the extremity of the base ring, - - - - - 5 66 At the extremity of the second reinforce, two inches before the trunnions, - - - - - - - - — — — Behind and before the muzzle rings, and at the extremity of the muzzle mouldings, - - - - - - - 5 15 The total weight of the cannon estimated at five thousand weight. Cannon for the Frigates. 24 pounders. The length from the hind part of the base ring to the extremity of the muzzle, - - - - - - - - 8 — Excepting in the length, all the other parts to be precisely of the same dimensions as the 24 pounders, which are nine feet in length, weight forty-five hundred.