164 REPORTS ON INVESTIGATIONS AND PROJECTS. 



ENGINEERING. 



Dorand, F. W., Stanford University, California. Grant No. 64. Experiments 



on ship 7'esistance and propulsion. (For previous reports see Year Book 



No. 2, p. XXXII ; Year Book No. 3, p. 113, and Year Book No. 4, p. 



170.) $4,120. 



Professor Durand reports that his researches are practically finished and 



he is engaged in preparing a final report to the Institution. A preliminary 



report on ' ' Experimental researches on the performance of screw propellers ' ' 



was published in the fall of 1905 in the Transactions of the Society of Naval 



Architects and Marine Engineers. 



Goss, W. F. M., Purdue University, Eafayette, Indiana. Grant No. 114. 

 Research on the deter miiiation of the value of high steam pressures hi loco- 

 motive service. (For previous reports see Year Book No. 3, p. 114, and 

 Year Book No. 4, p. 170.) $5,000, 



Professor Goss summarizes the results of his study concerning the value 

 of high steam pressures in locomotive service, the details of which will be 

 presented in Publication No. 66 of the Carnegie Institution of Washington, 

 as follows : 



(i) The results apply only to practice involving single-expansion loco- 

 motives using saturated steam. Pressures specified are to be accepted as 

 running pressures. They are not necessarily those at which safety valves 

 open. 



(2) Tests have been made to determine the performance of a typical 

 locomotive when operating under a variety of conditions with reference to 

 speed, power, and steam pressure. The results of 100 such tests have been 

 made of record. 



(3) The steam consumption under normal conditions of running has been 

 established as shown in Table i . 



(4) The results show that the higher the pressure, the smaller the possible 

 gain resulting from a given increment of pressure. An increase of pressure 

 from 160 to 200 pounds results in a saving of i.i pounds of steam per 

 horse-power hour, while a similar change from 200 pounds to 240 pounds 

 improves the performance only to the extent of . 8 of a pound per horse- 

 power hour. 



(5) The coal consumption under normal conditions of running has been 

 established as shown in Table 2. 



(6) An increase of pressure from 160 to 200 pounds results in a saving 

 of 0.13 pound of coal per horse-power hour, while a similar change from 

 200 to 240 pounds results in a saving of but 0.09 pound. 



(7) Under service conditions, the improvement in performance with 

 increase of pressure will depend upon the degree of perfection attending the 



