360 SURVEY OF THE COAST 



with the mural circle which Mr. Troughton was then making. 

 Dr. Pond gave me the most favourable account of this clock. 

 He told me it never deviated iroin true time more than half a 

 second ; atid accordingly I considered it proper to have the 

 clocks for the intended observaiories made by the same ar- 

 tist, and upon the sairic principles; as it is difficult to get a 

 very good clock, and the prices asked are proportionally far 

 above those of chronomtters. A greater number of the lat- 

 ter are constructed on account of their constant use in the 

 navy and naval commerce, which forms in England the prin- 

 ci|/al support of this branch of the arts, as well as of the ma- 

 thematical instrument making. 



Thf clocks were therefore constructed by the same artist, 

 Mr. William Hardy from Scotland, residing in London, and 

 who is eminent for various valuable inventions in the line of 

 clock and chronometer making, and for the very sui)erior 

 execution of all his works. The scapenient, as well as the 

 arrangement of the wheelwork, is of his invention, and exact- 

 ly siniilur to tlic clock of the Greenwich Observatory, with 

 only some small differences which 1 suggested, in order to 

 augment the stabihty, and facilitate the reading upon the 

 dial. 



As I have not access to these clocks at present, I cannot 

 give as full a description as might be desirable. 1 must 

 therefore confine myself to observing, that each of them con- 

 sists of four wheels, and has the hour wheel of about four 

 inches in diameter in the backward motion of the drum, car- 

 rying a plate whicii shows the hour through the dial plate. 

 It may however be useful to descril)e the scnp' ment fr<'m 

 the drawing which I made of it in London, as 1 know of no 

 description either of it or of the other peculiaiities of Mr. 

 Haidy's clocks. 



hi Plate VI. fig. 8, 9, 10, 11, rt, a, a is the scapement 

 wheel, with thirty teeth. The pinions go on jewels. It 

 stands l)eyond tiie hind plate of the clock b. b. Its outer pin- 

 ion goes in the bridge c, c projecting from the back plate, the 



