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NEGKETTI AND ZAMBRA, HOLBOEN VIADUCT, E.G., 



3127 Treble Barrel Air Pump (fig. 3127) for the Diving Apparatus, of sufficient 

 power to send down a plentiful and continuous supply of air to the Diver. 

 A Condensing Chamber. 



B Dial Indicator, denoting depth of water and pressure. 



The Diving Apparatus consists of a powerful treble-barrel air-engine (fig 3127), 

 gun-metal cylinders, wrought-iron crank, fly-wheel and handles, spanners, tinned 

 Copper Helmet with segment-screw;joint,lead weights, vulcanised tube, metal unions, 

 two diving dresses, suitable warm clothing, boots, signal line, ladder-line, &c., &c., 

 complete, in strong and secure packages. 



This Apparatus possesses the following advantages : 1. Should the Diver wish 

 to raise himself without signalling the attendant, he can do so by simply placing 

 his finger on the valve, which afterwards rights itself. 2. Without assistance he 

 can open his own Helmet, which is so constructed that the front eye can never be 

 lost, or become tight. 2. The Indicator always denotes the depth the Diver is at. 

 4. The condensing box secures a more continuous stream of air. 5. It also has a 

 copper cooling cistern, for great depths. 



Directions for use, and keeping in repair, se:it ivith each Apparatus. 



