ASTRONOMY. 167 



latitnde.s and longitudes, etc. It is also dosijiiied to encourage study, 

 on the part of the more advanced uuder-graduates, of astronomical 

 phenomena, as far as they may be within the reach of young amateurs. 

 A neat and suflicieutly commodious observatory building, 50 feet long 

 by 20 feet wide, on the average, has been built ou a knoll in the univer- 

 sity grounds 320 feet above mean sea-level. In the dome-room, at the 

 east end of the observatory, is an equatorial refractor of 0^ inches clear 

 aperture, objective (achromatic), by J. i3yrn, of New York, the mount- 

 ing, driving-clock, pier, etc., being by Fauth & Co., of Washington, 

 With this telescope are six negative and as many more jiositive eye- 

 pieces, and a fine position filar micrometer made by the same firm. A 

 spectroscope, capable of attachment to the equatorial or of being used 

 on a stand, is furnished with a flint prism, and also with one of Kow- 

 laiid's diffraction gratings, having 14,;534 lines to the inch. 



In the room next west are two of J. (ii-eeii's standard barometers, and 

 in a specially prepared shed upon the north side, a wet bulb, a dry bulb, 

 a maximum, and also a minimum thermometer, by II. J. (Irecn, of New 

 York. lu this shed is also placed one of Dra])er's self-registering " ther- 

 mograi>hs." 



On the northwest tower of the College of Letters are mounted a Rob- 

 inson anemometer and a wiiul-vane. These instruments are connected 

 by telegraph wires with an anemograph in tlie observatory, where the 

 velocity and direction of the wind nre antomaticallv recorded, ^^eteor- 

 ological observations and records are made at 7 A. M., 2 r. :m., and P. 

 M. (standard or mean time of the 120th meridian of longitude). Monthly 

 ]>rintedrei)orts are made to the U. S. Signal Service olflce in Sau Fran- 

 cisco. 



In the next room west is mounted a fine, large, portable '^ transit and 

 zenith telescope," of the type used by the U. S. Coast and Geodetic 

 Survey, but having an objective 3 inches in diameter. 



Two diagonal and two direct eye-])ieces belong to this instrument. 

 In the same room is a Howard Standard mean tinu^, clock, with grav- 

 ity escapement, mercurial compensating pendulum, and electric circuit 

 connections. The clock is fastened to a solid gianite ])ier 18 inches 

 s(]uare and G feet long, which is inclosed in a brick pier reaching to solid 

 rock 5 feet below the surface of the ground. The transit and equatorial 

 arc similarly founded. All the i)iers are disconm^jted from tlie lloors of 

 the observatory, A sidereal chronometer, made by Negns liros.. New 

 York, is mounted upon one side of the transit pier. 



On a shelf at one side of the transit-room is an electro chronograjdi, 

 by Fauth & Co., of Washington, and on another the switeli-board made 

 by the Sau Francisco Electric Company. An electric? circuit runs 

 throu<»h the clock, chronometer, chronograi)h, sonnd<'r, and relay, and 

 also into the equatorial-room, from which time may be marked on the 

 chronograph by means of a break-circuit key. Tlie switchboard is con- 

 nected with the Western Union telegraph line by a shortline to Dwight 

 Way-Station, Berkeley. 



