. Farrow's manual of military training . anchored. Ordinary anchors can be relied upon in goodholding ground only; when it is poor or the current unusuallyswift, two anchors may be used, one backing up the other. Construction of Floating Bridges.—The regular bridgeequipage is designed for unloading, construction, removal, and re-loading in the shortest possible time. There are four methods otconstruction, depending upon the character of the stream, the kindand location of materials, the force available, and the proximityof the enemy. It may be desirable to combine two or more ofthese methods.
. Farrow's manual of military training . anchored. Ordinary anchors can be relied upon in goodholding ground only; when it is poor or the current unusuallyswift, two anchors may be used, one backing up the other. Construction of Floating Bridges.—The regular bridgeequipage is designed for unloading, construction, removal, and re-loading in the shortest possible time. There are four methods otconstruction, depending upon the character of the stream, the kindand location of materials, the force available, and the proximityof the enemy. It may be desirable to combine two or more ofthese methods. The methods available are: (1) by successivebags, (2) by parts, (3) by rafts, and (4) by conversion. Comparison of the Four Methods.—The method of construc-tion by successive pontons possesses the great advantages overthe others of being applicable to all streams, whatever may betheir velocity, and of requiring the minimum quantity of equipage, 632 MILITARY TRAINING the fewest pontoniers, and the shortest time for its FLOATING BRIDGE BY , the labor of constructing a bridge by this method BRIDGES AND PONTOONS 633 increases rapidly with the number of bays. Thus the balk and chesscarriers in constructing a bridge of 40 bays are obliged to walk6^4 miles; in one of 50 bays, nearly 10^2 miles; of 60 bays, 14^4miles; and of 100 bays, 40 miles. The method by parts ordinarily is used in connection withthe method by successive pontons. When the bridge is to be morethan 40 bays in length these methods are combined as follows:The bridge is begun at both ends, if possible, by successive pon-tons and is pushed on rapidly toward the middle of the two portions thus formed are connected by parts which areconstructed in the meanwhile along the river bank above thebridge. The method by rafts is employed when the passage of ariver is to be forced, and when the rafts can be constructed un-observed by the enemy, in which case the pontoniers will be ex-posed
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