[37 1 U. S. FISH COMMISSION STEAMER ALBATROSS. 



*JO 



horse-power, increases with the number of lamps nsed, for the 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 dynama- 

 eugine 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 resi^ective 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 $106.74. 



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

 AT) minutes, and during 1884 1,481 hours and 30 minutes, making a 

 total of 3,074 hours and 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 iusulation compound .24 



1 wire shade-holder • .10 



^ pound 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' 



Repairs (shortening) of belts 5. 62 



2411ampst 241.00 



Total expenditure, exclusive of labor and interest : 665. 97 



* These figures include the work for 1883 and 1884. 



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

 entered to complete the account. 



