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October, 1913 2407, the pilot valve-939 being forced back from the cams. Just before the spray-air-relay valve-461 is opened fuel- oil control quadrant-416 is in position to allow fuel to be forced into the fuel pipes. The engine is now run- ning under fuel, all the air-starting mechanism being disengaged. The speed varies with the distance through which the hand wheel is turned. The farther over the wheel is turned the greater amount of fuel is pumped into the spray valve at each revolution, the fuel-oil control plate-416 regulating this by regulating the position of the stroke of the suction or regurgitating valve of the fuel-feed pumps. Working and Scavenger Cylinders The working and scavenger cylin- ders. are of cast iron, but for light- ness the housing and bedplates are of Pronze. Sketch III shows that the scavenging and working cylinders are separate castings in this type of en- gine. The working cylinder-256 is " water jacketed, as is the exhaust pipe- @e- The air-starting, spray. and scavenging valves are not jacketed. The piston head (A, Sketch I) is oil cooled. The oil from the wrist pin D enters a hole E inside the piston, flows through the head, and _ out through another hole F on the oppo- site side of the piston, through a pipe G that is led clear of the wrist pin and into the crankpit. The piston is made in two sections. Lower section B includes the body of the working piston and the whole of the scaveng- ing piston, while the upper section A is the piston head. This construction was adopted because of the trouble experienced with the core plugs in the top of the piston where the single- casting type had been used. After a certain length of time these core plugs would come out, in spite of all pre- cautions taken with their installation, and cause considerable damage. With the two-section type the holding- down bolts are in recesses in the side, and never come in contact with the hot gases, and, as the top has no holes of any description, there is now No trouble with core plugs loosening. The upper section is large enough to take all of the piston rings. The wrist Pin D is secured in the scavenging Piston and thus is not exposed to the heat of the working cylinder. This Sa great advantage in that it is not difficult to keep wrist-pin bearings cool, Several of these engines have been Siven very severe tests, one of them a full-power test of 28 hours. The lubricating system seems to be very Well designed, for, while 14 of these fngines have been tested, there has THE MARINE REVIEW not been a single case of hot bearings. A copy of the record ofa six-hour test of one of these engines follows. It will be seen that the powers are very uniform. In testing, the engine drives a generator and the power gen- 361 erated is absorbed by large pipe re- sistances which are cooled by water circulating through them. While the test is under way the volt and am- meter pointers scarcely move, showing how well the fuel feed is regulated. REPORT OF TEST.--FIRST THREE HOURS, Engine, 75-6. Type, H. S. No. 103, Date, 12-17-12. Time. cts |e 2:30 2:45 3:00 3:15 3:30 3:45 4:00 4:15 4:30 4:45 5:00 5:15 5: 30 Revolutions 2:34...... 450. 450 450 450 450 450° 450 450 450 450 450 450 450 NV OLS: gta eee 210° 210: 210 210 210 210% 210. 210 2103. 210.2 210. 10 ong Ampetes oot. 1,475 1,475 1,475 1.470 1,470 1,470 1,470 1,470 1,470 1,470 1,470 1,470 1,470 Ho Pe eee ee 443 443° 443. 441 441 44. aa 44) | 44 44d 44 44t 2 aay Consumption--Total for run: First three hours :-- Oil, 13.5 'gallons; fate, gallons per minute.......14:.,.5) Nc RSE ee ea 26 Water, 14,760. gallons: sate, callons per minute::....1.59 3 82 Fuel, 105 gallons; rate; pounds per horsepower hour,.<.2 9 .<...07.020 5) 0.57 Adjustments :--A, C. control, wide open. Control lever, 2% turns. Size of spray nozzle, 0.187. Fuel oil, lot No. 2, western oil. Lubricating oil, trade name, Autoline, No. 2. Condition of exhaust:---White smoke at end of pipe. Brown vapor at 3-inch try valve. Pressure, pounds: Air pump, first stage 105.2 105.105. 105 °.105 105 Ws = 105: -105 105 105. 105-105 Spray. air, 3 sea 875 900 900 900 900 900 900 900 900 900 900 900 900 Scavenger receiver... 93% 10 10 10 10 On ae 9 9 9 9 9 9 9 Oil) 4) ee eee 44 45 45 45 42 44 42 42 43 42 42 44 43 Water 44 eee 8 7% %7% 77% 8 7%. 7 7 7 Z 7 7 7 Auxiliary fuel ¢<, 5 5 5 5 5 5 5 5 5 5 5 5 5 Temperatures, deg. Fahr.: Exhaust, not taken:-- fe ; : Water. inlet 00... 46 46 46 46 46 46° 46 46 46 46 46 46 46 Water; outlet. 7.2.4. 90 90 90 90 90 90 90 90 90 90 90 90 90 Oil inlet 3.43, 65 85 90 96: 1005 100; 100) 3100 - 100:.-100:- 100-100: 21.00 Oil. outlet 2 130, 142,150) 158: 262) (167. lee 164. - 162: 160-160 160. 160 Scavenger 'receiver... 147-152 180: 200: 212: 206: .204;° 200: 198 2198. 198. 198. 198 Atmosphere 55... 68 68 68, 68 68 68 68 68 68 68 68 68 68 Crankpit wai ses 130°°-1402 160-1707. 174. 176 shee. 3-164 164" 162). 162 2162. 160 Remarks.--At the end of one hour the relief valves on the scavenger receiver were set at 9 pounds, ee: ; REPORT OF TEST._SECOND THREE HOURS. Engine, 75-6. Type, H. S. No. 103. Date, 12-17-12. s Time © sb ee 4 O00) 615 6 3036545 FOO 7 ls 430 7 7 45: S00 84 15 6.30 Revolutionsa@2.: o73.20 0.03 450, 450. 450 450:°°450:. 450 450. 450. 450: 450. 450 450 V OLS) 30 ee ee ee ~ 210. 22107 210. ~210. +210, -210 210 210: -210;. 210 210 +210 AAMPCLES = cue a ee eee eens 1,470. 1,475 1,470 1,470. 1,470. 1,470 1,470 1,470, 1,470. 1,470 1.470 1,470 Hlorsepower 2.55 oe: 441 443 441 441 441 441 #441 441 #441 #441 441 441 'Consumption--Total for run.--Second three "ey hours :-- _ Oil, 13.5 gallons; rate, gallons. per "minutes. 22 i ie es i ee se eee as 26 ¢ Water, 14.760 gallons; rate, gallons .per minute......... ates a ee eOne. ceo Oem 82 Fuel, 100.5 gallons; rate, pounds per horsepower hour.......... bette tee etter ees 0.55 Adjustments:--A. C. control, wide open. Control lever, 2% turns. Size of spray nozzle, 0,187. Fuel oil, lot No. 2, western oil. Lubricating oil, trade name, Autodine, No. 2. Condition of exhaust:--Same as first three hours. Pressures, pounds :-- Air compressor, f¥sr steze 105 105-105 105 108 105-108 40S" 105 405 105 tus SPLAy Alt ares ee eae 900 900 900 900 900 900 900 900 900 900 900 900 Scavenger receiver ....... 9 9 9 9 9 9 9 9 9 9 9 9 OU 5s ig ea ee eee rs 45 43 45 43 43 43 43 43 43 43 43 43 Water 2. oe i 7 Z 7 7 7 7 7 7 Poe 7 7 Auxiliary: fuel 42 2.22. 5 5 5 a 5 5 5 5 5 5 5 5 Temperatures, deg. Fahr.: Exhaust, not taken:-- Water inlets ess cy oe 46 += 46 46 Water -outleh 42 is => 90 90 90 Oil inlet <<a ee ee 100.2. 100: "200; 1 Oil outlet" 3... 160.) (160.- 160 1 Scavenger receiver....... ma 19S. 198.2 198) oo] Atmosphere ....-+++-++e0- 68 68 68 Crankpit' <35 2 os "160-160. .160:°-; 1 , 46. 46 4G" 46) 46. 46 46 46. 4G 90 90 90 90 90 90 90 90 90 00°: =100°: 100° 100:>, 100... 100; 100: 100. 100 58 158 3158 158 158" 158 158 158) 158 98: 198) 198 198 198 108 196. 196. 196 68 68 68 68 68 68 68 * 68 68 58° 158) 158 160. 160 3158. 158 7 the (ies Remarks :--During the last three hours not a single adjustment was made on engine or switch- board. Captain Alfred Brown, of the Flush- ing life saving station corps, swam from the Battery to Sandy Hook, a distance of 22 miles, last month. He was in the water 13% hours. Many have attempted this feat, but this is the first time it has ever been ac- complished. The Joseph Dixon Crucible Co., Jersey City, N. J., has received a let- ter from Fred Heckler, superintend- ent of the Lake Shore Electric Rail- way Co., Fremont, O., to the effect that Dixon's graphite cup grease No. 2 is the best lubricant for trolley wheels.