Diesel engines for land and marine work . scarried out were as follows :— (1) With normal admission of fuel and speeds of 250, 300,and 500 revolutions per minute. (Tests 1 to 6 in Table Y.) (2) With half normal admission and speeds of 250, 300,400 and 500 revolutions per minute. (Tests 7 to 10 inTable V.) (3) With maximum admission and speeds of 400 and 500revolutions per minute. (Tests 11 and 12 in Table V.) The efficiency of the dynamo was carefully determined foreach speed and output by running it at the various speeds at loG DIESEL ENGINES FOR LAND AND MARINE WORK no load, whence all the l
Diesel engines for land and marine work . scarried out were as follows :— (1) With normal admission of fuel and speeds of 250, 300,and 500 revolutions per minute. (Tests 1 to 6 in Table Y.) (2) With half normal admission and speeds of 250, 300,400 and 500 revolutions per minute. (Tests 7 to 10 inTable V.) (3) With maximum admission and speeds of 400 and 500revolutions per minute. (Tests 11 and 12 in Table V.) The efficiency of the dynamo was carefully determined foreach speed and output by running it at the various speeds at loG DIESEL ENGINES FOR LAND AND MARINE WORK no load, whence all the losses were calculated and theefficiencies obtained. These are included in the table, butthe figures from which they are deduced are omitted. Theoil consumption was obtained by taking the supply directfrom a vessel with a gauge glass, and at the beginning and endof each test the level of the oil in the vessel was arranged tobe at the same point as indicated on the gauge glass, theconsumption being made up by adding an accurately weighed. 100 200 300 Brake Horse Power Fig. 83.—Curve showing Fuel Consumption, amount of oil as required, and by this means intermediatecheck readings could be taken. The cooling water was passed through measuring tanksand its quantity determined, and the temperatures at theinlet and outlet as well as that of the exhaust gases wereregistered by mercury thermometers. In Fig. 83 the fuelconsumptions are represented graphically under all the con-ditions of the tests, and show remarkably constant about 250 revolutions perminute the consumption was 189 TESTING DIESEL ENGINES 157 grams., at 300 revolutions per minute 192 grams., and at 400revolutions per minute 1965 grams, per hour. Be-tween the working limits for which the engine was designed,namely 250 to 400 revolutions per minute, with normal fueladmission the difference w-as only 189-5 to 1965, or about 4per cent., this being readily accounted for by the greaterpower for t
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