Farrow's military encyclopedia : a dictionary of military knowledge . -l.(iO, L=l.()r>A, AI=.50A, N=.8r,I5—.10. lT=.t<(i((A. The dimensions. A, are ixTcssarily based upon theordinary merchant sizes of round-iron. The sizeswhich it has been found liest to .select are the fol-hiwiug ; Capacity of Hook, j), j, \, 1, U, 2, 3, 4, 5,. 6, 8, 10 tons; Dimension A, §, {i, J, l^V, U, ^, IJ,2, i\, 2+, 2J, 3j inches. The formulfe which jrivethe sections of the liook at the several points are allexpressed in terms of A and can therefore be readilyascertained by reference to the foregoius scale.
Farrow's military encyclopedia : a dictionary of military knowledge . -l.(iO, L=l.()r>A, AI=.50A, N=.8r,I5—.10. lT=.t<(i((A. The dimensions. A, are ixTcssarily based upon theordinary merchant sizes of round-iron. The sizeswhich it has been found liest to .select are the fol-hiwiug ; Capacity of Hook, j), j, \, 1, U, 2, 3, 4, 5,. 6, 8, 10 tons; Dimension A, §, {i, J, l^V, U, ^, IJ,2, i\, 2+, 2J, 3j inches. The formulfe which jrivethe sections of the liook at the several points are allexpressed in terms of A and can therefore be readilyascertained by reference to the foregoius scale. has sliown that hooks made accordingto the above formula will i;ive way first by o]Hningof the jaw, which,however, would notoccur excejit with aloud much in excessof the nominal ca-pacity of the yielding of thehook when loadedto excess becomes asource of safety, asit constitutes a sig-nal of danger whichcannot very readilybe over-lookefl, andwinch must proceedto some considerabledistance before rup-ture will occur andthe load be droji-ped. A comparisonof these hooks withmost of those in or-dinary use will showthat the latter are,as a rule, badly pro-portioned, and frequently dangerously weak. Hooksproportioned by the above fornudx- are used in allthe Weston cranes. See Crnntfx. HOOK-SWIVEL.—A device intend
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Keywords: ., bookcentury1800, bookdecade188, booksubjectmilitaryartandscience
