[2T] 



U. S. FISH COMMISSION STEAMER ALBATROSS. 



29 



feed or fire pump (Plate XXVI) is proportioned to work against great 

 pressures ; it is piped to take water from the sea or from tlie bilge, and 

 to deliver to the boilers, to the hydrant pipe (which delivers water to 

 hydrant connections on the side of the deck house, to the laboratory, 

 the engine room, and fire room), to the ash-chute, or overboard, at pleas- 

 ure. The steam cylinder is 9 inches in diameter, the water cylinder is 

 54 inches in diameter, and the stroke of piston is 12 inches. The max- 

 imum capacity of this pump is about 250 gallons per minute. 



The hydrant pump has a 7-inch steam cylinder, a 5-inch water cylin- 

 der, and a stroke of piston of 10 inches. It is piped to take water from 

 the sea or the bilge and will deliver it to the boilers, the hydrant pipe, 

 the ash-chute, or overboard ; its maximum capacity is about 200 gal- 

 lons per minute. 



Fig. 1. 



The three pumps are similar in design and in detail, differing only in 

 size and proportion. Fig. 2 shows the details and commercial names 

 of the parts. 



The parts of the pumps are manufactured to gauges and are inter- 

 changeable; the water. valves have unusually large openings; tlie 

 steam valves have positive motion as well as being " steam thrown ; " 

 the water cylinders are brass lined, the valve seats and stems, glands, 

 and piston rods are of brass. The working parts are quite accessible. 



INJECTORS. 



In addition to the pumps, two " Little Wonder " injectors are pro- 

 vided to feed the boilers. They take the water from the hot-well or from 

 the sea and deliver only to the boilers. They are especially useful in 

 feeding from the sea in cold weather, as they warm the water before 



