264 CARNEGIE INSTITUTION OF WASHINGTON. 



with the optical work done for the Army Ordnance Department. Mr. 

 Jones also assisted in the erection of the barracks on the campus of 

 Throop College of Technology for the use of the Students' Army 

 Training Corps. On Mount Wilson, in addition to the work on the 

 100-inch telescope, a dwelling-house was erected for the use of Mr. 

 Sherburne, night assistant, and much brush was cleared to decrease 

 fire risks. The necessary building repairs, and the regular work of 

 clearing and maintaining the mountain road, were also carried out 

 under the direction of Mr. Jones, superintendent of building con- 

 struction. 



Mr. Dowd, engineer in charge of the Mount Wilson power-plant, 

 has continued the electrical wiring in the dome of the 100-inch tele- 

 scope, mounted and connected an anemometer at the summit of the 

 dome of the 150-foot tower, installed a new circulating tank in the 

 150-foot tower telescope, wired the new spectrograph of the Snow 

 telescope, and done wiring and made various repairs in connection 

 with other instruments. 



