1872.] 



Lieut. -Col. A. Strange on a new Theodolite. 317 



May 2, 1872. 



The EARL OF ROSSE. D.C.L., Vice-President, in the Chair. 



Ia conformity with the Statutes, the names of the Candidates recom- 

 mended for election into the Society were read from the Chair as follows : — ■ 



Prof. William Grvlls Adams, M.A. 

 Andrew Leith Adams, M.B. 

 Frederick Le Gros Clark, F.R.C.S. 

 Prof. John Cleland, M.D. 

 Prof. Michael Foster, M.D. 

 Prof. Wilson Fox, M.D. 

 Arthur Gamgee, M.D. 

 Rev. Thomas Hineks, B.A. 



Prof. William Stanley Jevons, M.A. 

 Prof. George Johnson, M.D. 

 Prof. Thomas Rupert Jones. 

 Major Thomas George Moutgomerie, 

 R.E. 



Edward Latham Ormerod, M.D. 

 Edward John Routh, M.A. 

 William James Russell, Ph.D. 



The following communications were read :— 



I. " On a new Great Theodolite to be used on the Great Trigo- 

 nometrical Survey of India, with a short Note on the performance 

 of a Zenith-Sector employed on the same work." By Lieut.- 

 Colonel A. Strange, F.R.3., Inspector of Scientific Instru- 

 ments, India Department. Received April 25, 1872. 



On the 28th of February, 1867, I had the honour of submitting to the 

 inspection of the Royal Society a Transit-Instrument and a Zenith-Sector 

 made for the Great Trigonometrical Survey of India, to be used re- 

 spectively for the determination of longitude and latitude on that work. 

 These were one instalment of the following list of geodesical and astronomical 

 instruments which the Secretary of State for India deputed me to design 

 and superintend under construction : — 



One Great Theodolite, with a 3-feet Horizontal Circle. By Messrs. 

 Troughton and Simms. 



Two Zenith-Sectors. By Messrs. Troughton and Simms. 



Two 5-feet Transit-Instruments. Bv Messrs. T. Cooke and Sons, 

 York. 



Two smaller Transit-Instruments (German form). By Messrs, 

 T. Cooke and Sons, York. 



Two 12-inch Vertical Circles (German form). By Messrs. Repsold, 

 Hamburg. 



Two Galvanic Chronographs for registering Transit-Observations. 

 By MM. Secretan and Hardy, Paris. 



Three Astronomical Clocks. By Mr. Charles Frodsham. 

 vol. xx. 2 A 



