35 APPARATUS FOR DRIVING COPPER BOLTS INTO SHIPS. 



Clock of Ar- obtains in a pendulum vibrating in a non-refitting medium by 



™ad beat ancT ^ e ^ orce °^ g rav i tv : an< *> on making ufe of corrections deduced 



ompound pen- from that principle, I found them agree fo well with the going 



dulum, found of the dock M left me nQ rearon tQ doubt Q r the truth of 

 to vary accord- , J 



ing to the theory, conjecture. The table which I fent you was therefore con- 

 stantly ufed to correct the clock's rate, when any alteration 

 was obferved in the arc of vibration; but the rate itfelf was 

 ascertained by tranfits of the fun and fixed ftars over the meri- 

 dian. 

 It 13 thought Flow far this table may be applicable to other clocks I know 



that the correc- not ^ as ^is is the only inuance in which I have had any expe- 



lions would not . J J * 



be applicable in nence. It is evident, however, that this theory cannot be 

 fome other com- u fed to advantage where a pendulum is acted upon either by 

 cycloidai cheeks, a faddle-piece, or pallats of a particular con- 

 ftruclion. 



I am, SIR, 



With much refpect, 



Your humble fervant, 

 E. WALKER. 



VII. 



Dtfcription of an Apparatus of Tubes for facilitating to driving of 

 Copper Bolts into Ships. By Mr. Richard Phillips*. 



Mr. Phillip^ IViR. RICHARD PHILLIPS, of Briftol, in feveral letters 

 method of driy- f ent to t h e Society, nates, that he had invented a method of 

 Sit. ' driving copper bolts into (hips, without fplitting the heads or 



bending them ; and that by means of tubes contrived by him 

 for the purpofe, this could be effected without difficulty, and 

 had been fatisfactorily executed in the prefence of feveral of 

 the principal (hip-builders of Brinol. 



A certificate accompanied thefe letters, from Mr. William 

 James, and Mr. Samuel Haft, fliip-builders, and alfo from 

 Mr. George Winter, of Briftol, teftifying that they had tried 



* From the Tranfaclions of the Society for the Encouragement 

 of Arts, &c. for 1801. The Society adjudged a reward of forty 

 guineas to the inventor. Models are in their repofitory. 



the 



