[37 I U. S. FISH COMMISSION STEAMER ALBATROSS. 3D 



horse-power, increases with the number of lamps used, for tlie reason 

 that the fraction of the power utilized becomes larger at the higher 

 power. The cost, in coal, of a horse-power developed by the dynamo- 

 engine has been arrived at by calculating the quantity of steam passed 

 through the steam-cylinder and reducing this to pounds of water evap- 

 orated by a pound of coal. Had steam been used for the light alone 

 this calculation would have been unnecessary, but as it was used from 

 the same boiler to warm, ventilate, and light the ship at the same time, 

 the writer adopted this method of separating the respective quantities. 

 From these indicator diagrams I have calculated that a horse power 

 costs 30.7 pounds of water or 3.41 pounds of coal per hour. The mean 

 cost of coal during the two* years the ship has been in commission has 

 been $0.07 per ton, or 0.271 cent per pound. The total cost of the oil 

 used on the dynamo and its engine has been $100.74. 



During the year 1833 the dynamo was in operation 1,592 hours and 

 45 minutes, and during 1884 1,481 hours aud 30 minutes, making a 

 total of 3,074 hours aud 15 minutes. 



The cost of running the plant for the two years has been — 



Total cost of coal : 



For 1883 $79.60 



For 1884 95.51 



Total cost of oil : 



For 1883 48.57 



For 1884 58.17 



2 K brushes 5.00 



11 Z brushes 11.00 



2 cut-out blocks *. .64 



73 3-light cut-out plugs 5.84 



16 6-light cut-out plugs .48 



5 20-light cut-out plugs .40 



13 40-light cut-out plugs 3.20 



5 key-sockets 4. 60 



2 pounds of insulation compound .24 



1 wire shade-holder .10 



\ pouud insulation tape .24 



2 attachment plugs .80 



3 pounds No. 14 insulated wire 1. 20 



1 pound No. 20 insulated wire .40 



1 new valve for the engine 5.00 



1 new cross-head for the engine 25. 00 



1 new belt 20.00 



Re{>airs (shortening) of belts 5.62 



241 lamps t .* 241.00 



Total expenditure, exclusive of labor and interest 665. 97 



* These figures iuclude the work for 1883 aud 1884. 



tThe lamps do not now come in the writer's department on board, but are here 

 entered to complete the account. 



