250 SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE VOL. 2< 



ceived from the director in charge of the aeronautical department of the Ex- 

 position: " On account of lack of competition engine tests abandoned." As 

 the main object of entering the engine in the competition was to insure for it 

 an unquestioned record of its performance it was decided to reassemble it in 

 the testing frame in Washington and invite some engineers of prominence to 

 witness and certify to its performance, but on account of the lack of funds for 

 meeting the expenses incident to such a series of tests as it was planned to 

 make this was never done. 



In the tests which were witnessed on April 26, 1902, by Captain I. N. Lewis, 

 Recorder of the Board of Ordnance and Fortification, the engine was held down 

 to a pull of 200 pounds on a 13-inch lever, when running at 1000 revolutions per 

 minute. In the later tests in May, 1903, which were witnessed by Captain Gib- 

 son, who was then Recorder of the Board of Ordnance and Fortification, and 

 Mr. G. H. Powell, the Secretary of the Board, the engine was allowed to work 

 at a pull of 265 pounds on the 13-inch lever arm at a speed of 950 revolutions 

 per minute. In the tests made in August, 1904, the engine was run for ten con- 

 secutive hours ' at a pull which varied from 263 to 271 pounds, or an average of 

 267 pounds, on a 13-inch lever, with the speed varying from 945 to 955 revolutions 

 per minute, thus showing 52.4 horse-power at the average speed of 950 R. P. M. 



Detailed Weight of New Laboe Engine. 

 Name of part. Weight in grammes. 



Crank shaft 5.225 



Connecting rods ( total ) 5,005 



Pistons— No. 1 1.652 



No. 2 1.647 



No. :: 1.655 



No 4 1.660 



No. 5 1.646 



Cylinders — No. 1 (including exhaust and inlet valves, oil cups, etc.) . . . 4,768 



No. 2 (including exhaust and inlet valves, oil cups, etc.) . . . 4.6S5 



No. 3 (including exhaust and inlet valves, oil cups, etc.) . . . 4.63S 



No. 4 (including exhaust and inlet valves, oil cups, etc.) . . . 4.637 



No. 5 (including exhaust and inlet valves, oil cups, etc.) . . . 4.796 



Port crank chamber drum, including cam, cam gears, punch rods, etc. . 5,225 



Starboard crank chamber drum 3,440 



Spark plugs ( 5 ) 450 



Outlet water pipe 450 



Inlet water pipe 360 



Inlet gas manifold 1.700 



Primary and secondary sparkers and wires 512 



Balance arm with braces for same — starboard 1.040 



Balance arm with braces for same — port 1,067 



Total 56,323 = 124.17 lbs. 



Starboard fly wheel 3,946 



Port fly wheel 3 - 234 



Total weight of engine and fly wheels 63,503 = 140.00 lbs. 



Spark coil and batteries 6,800 



Carburetor 3- I 51 



[nlet gas pipe from carburetor to manifold 756 



Gasoline tank I- 004 



Wiilcr tank 717 



Water circulating pump and shaft 807 



Radiator 7 - 70Q 



Total weight of power plant 85,038 = 187.47 lbs. 



'See foot-note, page 24!) 



