312 INDIAN METEOROLOGY. 



COLABA AMD MADRAS OBSERVATORIES. 



The Government Observatory at Oolaba is under the direction 

 of Mr. Charles Chambers, F.R.S. It is devoted principally to the 

 record and publication of facts and the prosecution of inquiry in 

 terrestrial magnetism and meteorology, to astronomical observation 

 for the purpose of time-keeping, and to the signalling of time for 

 purposes of navigation. The results of the observations are pub- 

 lished annually in the form of a quarto volume. The autographic 

 instruments, Avhich are maintained in continuous action, are the 

 following : — 1. Declination magnetograph. 2. Horizontal force 

 magnetograph. 3. Vertical force magnetograph. 4. Barograph. 

 5. Thermograph, dry -bulb and wet - bulb. 6. Pluviograph. 

 7. Anemograph, direction and velocity. 



The harbour clock and time-ball are worked by electric cim-ent 

 from the Observatory, which is also charged with the custody of a 

 store of Indian Government and Admiralty chronometers. Chrono- 

 meters of merchant ships are also received for rating. 



There ■ is also an astronomical observatory at Madras, until 

 lately under the direction of Mr. N. R. Pogson, CLE., who held the 

 post of Government Astronomer from 1860 until his death on June 

 23rd, 1891. This observatory gives uniform time to the greater part 

 of India for railway and other purposes, and its longitude* is the fixed 

 point of the departure of the Trigonometrical Survey of India. 



From the period of his taking charge up to 1885, Mr. Pogson 

 discovered the following six minor planets between the orbits of 

 Mars and Jupiter : — 



Name. Date of Discovery. Period of Revolution. 



Asia 



- 18G1, April 17 



3 



9 5 



Freia 



- 1864, February 2 - 



6 



3 23 



Sappho - 



- 1864, May 3 



3 



5 22 



Sylvia 



- 1866, May 16 



6 



6 



Camilla 



- 1868, November 17 



6 



6 7 



Vera 



- 1885, February 6 - 



5 



4 24 



Asia was so named on account of its being the first astronomical 

 discovery made in that quarter of the globe. Freia was first dis- 

 covered by Professor D' Arrest, at Copenhagen, 1862, October 21st, 



* Its latest determination of longitude, as mentioned on page 213, is 80° 14' o0 - 03" E. 

 of GreeiiH ich. 



