MOUNT WILSON OBSERVATORY. 265 



BUILDINGS AND MISCELLANEOUS CONSTRUCTION. 



No new buildings have been constructed on Mount Wilson, but 

 considerable work has been done there in connection with the erection 

 of the Cassegrain observing-platfomi and other accessories of the 

 Hooker telescope. The dome of the 60-inch telescope has been re- 

 painted, much brush has been cut for fire protection, and the usual work 

 of clearing and maintaining the mountain road has been carried out 

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

 struction. In Pasadena a wing has been added to the physical labor- 

 atory for the 500-k. w. motor generator-set and a large tank has been 

 built under the optical shop for the coohng-coils of the solenoid magnet. 

 The construction of piers for the velocity-of-light apparatus and its 

 installation at several different sites should also be mentioned. 



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

 has completed the electric wiring for the Cassegrain observing-platf orm 

 of the Hooker telescope, installed the refrigerating plant for the 100- 

 inch mirror, and done much other wiring and work of repair. 



