American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Equipment, Logan, George Wood, 1868-1915 · Washington, Govt. Print. Off. · leaf 210
ing to localconditions, which support the wire by means of steel-cable stirrup lines, adjustablein length like the chain stirrup hnes on the terminal buoys. At intermediate 50-footconnections, cedar toggles or floats, which have a httle more buoyancy than issufficient to support the wire between… … Fig. 67. 204 MAEINE SURVEYING. weight of 165 pounds is suspended from each of the terminal stirrup lines, and aweight of 20 pounds from each of the intermediate stirrup lines. The length of thedrag may be varied through a wide range to suit the conditions existing in thelocalities to be examined.…
Navigation · Nautical astronomy
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