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II. 

 ASTRONOMICAL OBSERVATIONS 



IN 



FORT WILLIAM, 



AND BETWEEN 



MADRAS and CALCUTTA. 



By Colonel THOMAS D. PEARSE, 



Commandant of the Artillery, and Second in Command 

 of the Bengal Army. 



BEG leave to communicate to the Society fome 

 -*■ Aftronomical Obfervations which I made at differ- 

 ent times in Fort William. 



The clock I ufed from December, 1775, was made 

 by Ellicot : It beats dead feconds : there is one hand 

 for minutes, and the hours revolve with the plate fixed 

 to the hour-wheel. 



The pendulum can be lengthened without flopping 

 the clock, by means of a fcrew, which fupports the 

 fpring by which the pendulum hangs. And the pendu- 

 lum is defcribed in the 47th volume of the Philofophi- 

 cal Tranfadions, p. 479. The clock-cafe is firmly 

 fcrewed to the wall. The tranfit inftrument was made 

 by Sisson; it is four feet long, and has a double ob- 

 ject glafs. This is fupported by two iron bars, which 

 are joined to a fquare frame, that lies two feet under 

 the floor, buried in brick-work. 



The upright bars are protected by a cafe of wood, 

 which is fixed to the houie, without touching them in 

 any part. 



At firft I ufed the cornice of the Commandant's 

 houfe to adjuft by; but afterwards a Aider, with a flit, in 



place. 



