[13] CONSTRUCTION AND WORK OF FISH-HAWK. 15 



Auxiliary boiler is of the vertical fire tubular type, 48 inches diame- 

 ter, and 7 feet 8 inches in height, with 106 brass tubes, 2i inches outside 

 diameter, and 5 feet 2 inches long. Boiler rests on a cast-iron frame 14 

 inches in height. Upper end of boiler surrounded by a casing of iron 

 1^0. 12 wire gauge, and secured to deck by 1^-inch angle-iron, fastened 

 with wood-screws. Smoke-pipe is 18 inches diameter and 18 feet in 

 height. 



The boiler was tested to 120 pounds hydrostatic pressure, and is fit- 

 ted with all the necessary grate-bars, bearers, safety-valve, steam-gauge, 

 gauge-cocks, blow-cocks, and "check- valves." This boiler can be sup- 

 plied with water either by a Hancock "inspirator" or by the auxiliary 

 pump, and has the same steam connections as the main boiler. It is 

 situated on the main deck, immediately over the fire-room. 



Steam-pump. — There is one fly-wheel steam-pump with water-cylinder, 

 5 inches diameter and 12 inches stroke, having all the necessary con- 

 nections to be used as a fire-pump, as a feed to main or auxiliary boiler 

 from either hot- well or the sea, as a bilge-pump, as a circulating pum}) 

 for Baird's distiller, and to supply hatching tanks. There is a double 

 exhaust connection to either condenser or atmosphere. In case of fire 

 the flow of water can be increased by combining this pump with the 

 independent bilge-pumi). By means of the proper gearing, this pumj* 

 works the hatching cylinders on outside of ship. The suction-pipe is 

 connected with the overflow-pipe from hatching apparatus, so that the 

 same water can be used repeatedly for hatching. There is a connection 

 on the "manifold" for suction-hose of sufiicient size to supply both aux- 

 iliary and bilge-])umps. All water-pipes are of copper; steam and ex- 

 haust pipes of iron. 



Miscellaneous. — There is one ash-chute for discharging ashes over 

 side of ship; eight cast-iron deck scuttles on main deck with close cov- 

 ers and gratings; two iron ventilators, 10 inches diameter, to fire-room, 

 with revolving caps, and also used to hoist ashes. The fire room is cov- 

 ered with rough cast-iron floor-plates one-half inch thick, and above fire- 

 room is an open cast-iron grating for ventilation. There are steam- 

 heaters in pilot-house, and all habitable portions of the ship are fitted 

 with the proper steam and drain pipes and valves. All heaters drain 

 into a "trap" in fire-room, and a vapor-pipe from top of "trap "leads to 

 escape-pipe from main safety-valve. There are the proper tanks for oil, 

 waste, and tallow. There is a steam-whistle 6 inches diameter of bell 

 with valve where attached to boiler. In the engine-room there are three 

 gongs, one of 12 inches diameter, and two of 8 inches diameter, with 

 "jingle" bell; all arranged with proper wires and pulls to pilot-house; 

 also shield and tube to return sound to pilot-house, and a speaking tube 

 from engine-room to pilot-house. 



In the engine-room there are two Gi-inch nickel-plated gauges, one 

 for steam and the other for vacuum ; two counters, one for each engine, 

 and a nuirine clock. There are the proper oil-cups to all Journals; also 



