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

DESCRIPTION OF THE DIVER’S APPARATUS, AND HINTS AS TO THE CARE OF SAME. DIVING PUMPS. The following types of Hand-worked Diving Pumps are in general use :— (a) Two-cylinder Double-acting, for two divers working simultaneously in mode- rate depths, or one diver in deeper water. This type is supplied to the British Admiralty ; it is also largely used on Harbour and Dock Works. (b) Four-cylinder Single-acting, for the same duty as above. (c) Three-cylinder Single-acting Pump for one diver. 1 his is largely used on Harbour, Dock and Bridge Works, and for Pearl and Sponge Diving, etc. (d) Two-cylinder Single-acting, for one diver working at moderate depths. (e) One-cylinder Double-acting, for one diver working in moderate depths. 1 his type is also used by the British Admiralty, for depths not exceeding 40 to 50 feet. (f) One-cylinder Double-acting, for one diver. This is a very light, portable pump for shallow water work. The whole of the above pumps are of the rotary type.* The Baseplates, Valve Chambers and Cylinders are of Gunmetal. I o ensure absolute reliability under all working conditions, iron for any of these parts should be avoided. The Valves are interchangeable, and are readily accessible without removing the pump from its chest. Each pump is fitted with a compound gauge, which indicates both the pressure of air and the depth of water at which the diver is working. Air-distributing Arrangement.— 1 he lwo-cylinder double-acting- and Four- cylinder single-acting pumps are provided with a patent air-distributing cock, which enables each double-acting cylinder, or each pair of single-acting cylinders to act in- dependently of the other, the pump then supplying air to two divers at different pres- sures if necessary, or both double-acting cylinders, or all lour single-acting cylinders, as the case may be, to deliver their air through one nozzle and length of piping at will. The arrangement is worked by a rod, operated from the upper part of the pump chest by means of the lever shown in photo No. 12. ® Illustrations and further particulars of the pumps will be found in Siebe, Gorman & Co.’s General Catalogue. 22