294 CARNEGIE INSTITUTION OF WASHINGTON. 



The actual size of this error is ^^oVt) o inch, and it could be removed by a 

 correcting mechanism. It has been decided, however, to attempt its 

 removal by correcting the eccentricities directly, a method which, 

 if successful, will make the adjustment more permanent than if a 

 correcting mechanism is employed. 



Buildings and Miscellaneous Construction. 



The only two buildings erected on Mount Wilson during the year 

 were an underground concrete cliamber for constant temperature 

 conditions in sensitizing plates for the red and infra-red and a tempo- 

 rary pier and shelter used by Professor D. C. Miller for his experiments 

 on ether drift. The work of repair included painting the 150-foot 

 tower telescope tube, several of the cottages, and the woodwork of 

 the Monastery, laboratory, and power house. Brick chimneys have 

 been built in three of the smaller cottages in order to reduce the risk 

 of fire. 



