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On the upper surface of the cheeks, near the rear ends, are placed two projecting bolts which, with the curve of the cheeks, form resting places for the trunnions, when the piece is in position for transportation. They are called traveling trunnion-beds. When the piece is in this position, its breech rests upon the bolster, which is a curved block of wood, bolted to the upper side of the stock. On each side of the trail, and perpendicular to it, a strong manœuvring bolt is placed to serve as places to apply the handspikes in manœuvering the carriage.
27. What is the object of the traveling trunnion-beds?
For the purpose of distributing the load more equally over the carriage.
28. Mention the parts composing the limber.
The fork, the splinter-bar, the hounds, the sweep-bar, the tongue, the pintle, the lashing-chain, the axle-tree (iron). The sweep-bar is of iron, and on it rests the trail, which by its weight keeps up the tongue.
29. Why is it unnecessary for siege-carriages to have the same degree of mobility and flexibility as field carriages?
Because siege-carriages are, properly speaking, transportation wagons for use on roads, and never intended for manœuvring with troops.
30. How many horses does the transportation of siege-guns require?
A 24-pdr. requires ten horses (five drivers); a 12 or 18-pdr., eight horses (four drivers).