+--------+------------------------+-------------------------+------+ |Nature. | Fuze Diameter. | Composition. |Drove | | +--------+-------+-------+---------+-------+-------+by one| | | below |at the | at the|Diameter.|Length.|Time it|man in| | |the cup.|bottom.| cup. | | |burns. |1 day.| +--------+--------+-------+-------+---------+-------+-------+------+ |Inches. | Inch. |Inches.|Inches.| Inch. | Inch. | ″ | Nᵒ. | | 13 | 2.1 | 1.575 | 2.49 | .5 | 8.4 | 35 | 25 | | 10 | 1.8 | 1.35 | 2.13 | .438 | 7.2 | 33 | 25 | | 8 | 1.3 | 1.25 | 1.78 | .375 | 6.37 | 29 | 30 | | 5½ | 1.1 | .825 | 1.3 | .275 | 4.4 | 18 | 50 | | 4⅖ | 1.0 | .75 | 1.18 | .25 | 3.5 | 15 | 700 | |Grenades| 0.8 | .6 | .9 | .2 | 2.25 | | 1000 | +--------+--------+-------+-------+---------+-------+-------+------+ Diameter inside the cup is 3 diameters of the bore. Depth of the cup 1½ do. Thickness of wood at bottom of the bore, 2 diameters. _To find the Length of Fuzes for any Range._ The 13 and 10 inch fuzes of the same length burn so nearly equal, that one common length answers both, as do the 8 inch, 5½ and 4⅖. Therefore, to find the length of fuze for any range, multiply the time of flight by .22 for the 13 and 10 inch, and by .24 for the 8, 5½, and 4⅖; which is the decimal part of an inch a fuze burns in a second. Fuzes are thought to keep better by being painted; and for field service, are often marked off by black lines into seconds and ½ seconds. _GABIONS._—Small gabions of 3 feet high, and 2 feet diameter, are made with least trouble, and are easiest carried. The pickets for them must be 1½ or 2 inches thick, and 4 feet long. Large gabions are 6 feet high, and 3 feet in diameter; and require two men to carry them. The smallest gabions or baskets are formed of pickets, 1 inch in thickness, and 1 foot long: they are 12 inches in diameter at top, and 10 at bottom. The small gabions have 7 or 8 pickets, the large ones 9 or 10. _To make them._—The pickets are first to be fixed in the ground in a circle, the size of the bottom of the intended gabion; then a few twigs are to be wove through the upper ends, to keep them from flying out; afterwards the work must be begun at the bottom and continued upwards; and the whole being well driven down with a mallet, the edges must be secured by twigs, wattled up and down. The twigs of willow, birch, hazle, alder, poplar, and beech are proper for this purpose. The top of the gabion must be made very even, because that becomes the bottom when finished. Four men are usually employed on each gabion, with a billhook, a mallet, a spade, and two axes. Two collect the wood, while the other two form the gabion. A 3 foot gabion ought to be made in half an hour.