Submarine Appliances And Their Uses
Deep Sea Diving, &c., &c.

each fathom of wire run out> with the vessel travelling at all the varying speeds. Conse- quently, when taking a sounding, and the vessel’s rate of speed at that moment being known, the corresponding DEPTH for any length of wire can be INSTANTLY ASCERTAINED THE MOMENT THE LEAD TOUCHES BOTTOM, by inspection of the following tables. ’ SPEED AND DEPTH TABLE? Machine, Kelvin’s Mark IV. Automatic Brake Weight, 6 lbs. Sinker, Kelvin’s M.C.I. with lead core, weight Wire led through Kelvin’s carrier and block. 24 lbs. Plaited Hemp Line, 12 ft. long. .Guard Tube, Seized on 3 ft. above eye of Wire, Seven Strand. sinker. APPROXIMATE VERTICAL DEPTH. FATHOMS OF WIRE RUN OUT. APPROXIMATE VERTICAL DEPTH. FATHOMS OF WIRE RUN OUT. Speed in Knots. 6 8 10 12 13 . . Speed in Knots. G 8 10 12 13 5 Fathoms 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 n 9 10j Hi 13 141 15f 17 18 19| 20 J 22 23 24| 26 27 i 28| 30 31 7.1 9 10i 12 14 15| 16| 18 19| 211 23 241 26 27| 29 30 * 32" 33| 35' 361 111 13| 15 16| 18$ 20 211 23 25 26 À 28 30 31| 33| 35 37 39 41 42| 101 13 15 17 19 21| 23 25 27 28| 30| 321 34J 36 | 381 40Ï 421 45 46£ 49 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 25 Fathoms 26 27 28 29 30 31 32 „ 33 34 35 36 37 38 39 40 41 42 43 44 45 „ 32| 33i 35 36 37 38^ 40 41 42j 43J 45 46 47i 48| 50 51 52| 54 55 56 i 58 38 39| 41 42| 431 45 46| 48 49i 51 52| 54 55 i 57 58j 60 45 46J 48| 50 52 531 55 j 57 59 60 J 624 51 53 55| 57j 60 62 67 69 71- 74 54| 564 58£ 61 63 65 ♦Copyright of Messrs. Kelvin & James White Ltd., and reproduced here by their permission. It may be added that the proportion of wire to depth differs not only with the speed of the ship but also with the roughness of the sea, and with the depth itself. Co-pyright. Photo L. Illustration of Method of Working Sounding Machine. 12 I