RATE AND ERROR OF BARRAUD'S SIDEREAL CLOCK, NO. 1190. 



NOVEMBER 18, 1849. The clock is placed within a niche in the wall. The case rests on a 

 block of masonry connected with the wall as loosely as practicable. The back of the case, at 

 about half its height, is screwed to a wall-binder. The niche is lined with painted tin to pre- 

 serve the case from saline moisture. The barometer and a detached thermometer are suspended 

 close to the clock. Pendulum adjusted yesterday. 20 grains removed from cistern this morn- 

 ing. Now there is not any adjusting weight upon the cistern. 



