284 CARNEGIE INSTITUTION OF WASHINGTON. 



Aside from the larger pieces of construction, much miscellaneous 

 work has been done. The steel roof of the power-house extension has 

 been built and erected. An additional room to the janitor's cottage 

 has been built and the few remaining electric wires above ground have 

 been placed in underground conduits. A 6-inch centrifugal exhaust 

 fan with a galvanized pipe leading to the bottom of the pit of the 150- 

 foot tower telescope has been installed for the reduction of the humidity 

 in the pit; an automatic switch board with remote control for five 

 motors and direct control for two has been constructed by the power- 

 house shop for the 60-foot tower telescope; a still similar to that used 

 with the 25 horse-power engine has been built for the exhaust pipe of 

 the 50 horse-power engine, which yields all the distilled water required 

 on the mountain and in the laboratories in Pasadena. As protection 

 against fire, much dead brush has been removed and metal-covered 

 shutters have been attached to the windows of the laboratory, power- 

 house, and battery room. Some of the smaller buildings have been 

 repainted, and many minor changes and improvements have been made 

 in the buildings and instruments. 



The Observatory has also made a few additions to the 40-foot tower 

 of the Smithsonian Astrophysical Station. 



