19. What difference is there in sabots for field service?
Sabots for shot, and spherical case for guns, have one groove for attaching the cartridge—those for gun canisters and for the 12-pdr. howitzer shells, spherical case, and canisters, have two grooves. Those for the 32 and 24-pdr. howitzers have no grooves; but are furnished with handles made of cord, passing through two holes in the sabot, and fastened by knots on the inside.
20. How are projectiles for field service fastened to the sabot?
By straps of sheet-tin, or of strong canvas, when tin or sheet iron cannot be procured.
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21. How many straps are employed, and how are they fastened?
For shot, there are two straps crossing at right angles, one passing through a slit in the middle of the other. For shells, there are four straps soldered to a ring of tin, or fastened to it by cutting four slits in the ring, into which the upper ends of the strap are hooked, and turned down on the inside of the ring. The sabots for 32 and 24-pdr. field howitzers having no groove, each strap is fastened by one nail on the side, and two under the bottom of the sabot.
22. What is a canister for field-service?
It consists of a tin cylinder attached to a sabot and filled with cast-iron shot.
23. How is it made?