RKPORT OP EXECUTIVE COMMITTEE xxxlll 



model propellers was finished. To complete the investigation im- 

 mediately in view, fourteen propellers remain to be experimented 

 with. He feels that the complete experimental determination for 

 thirty-five propellers constitutes a most satisfactory summer's work. 

 This is five-sevenths of the entire field to be covered by this par- 

 ticular investigation. The work of making the detailed reductions 

 and analyses of these observations will presumably occupy most of 

 the winter. But very gratifying progress has been made in the pre- 

 liminary measurements, speed having been determined from distance 

 and time records in 444 cases and thrust-turning momentum deter- 

 mined by integration from autographic records in 655 cases. 



Leonard Waldo, New York city. Grant No. 22. For study of 

 alumimim bro7i2cs. $4,500. 



Abstract of Report. — Mr. Waldo reports that through the death of 

 his associate, George S. Morison, and the breakdown in health of 

 his chief assistant progress has been slow ; he is unable to do more 

 than report progress. He 



(a) Prepared a bibliography on alloys of aluminum and copper 

 and of other aluminum compounds. 



(<^) Has had in operation six kinds of specially built furnaces, 

 and is building a seventh, to determine the best methods for making 

 large castings and sound wire bars or billets of aluminum bronze. 



if) His rolling mill experiments for producing tubes, sheet, wire, 

 and forged bars, from billets cast during the year, are practically 

 complete and are satisfactory. 



Notes taken during the process of rolling and cold drawing, rela- 

 tive to temperature, speeds, and cost are awaiting collation and 

 reduction. A complete report will be prepared during the coming 

 year. 



Exploration. 



Raphael Pumpelly, Newport, R. I. Grant No. 37. For prelimi- 

 nary examination of the tracts- Caspian region. $6,500. 



Abstract of Report. — The reconnaissance covered a region of 1,750 

 miles in length, with trips from 10 to 300 miles away from the rail- 

 road base. Throughout the great part of this area the remains of 

 ancient occupation abound, in the form of large tumuli, village sites, 

 fortresses, and cities. 



The structure of the tumuli examined and their contents indicate 

 a very remote beginning and occupation during long periods. The 



