New detached Efcapemeni. 363 



I have not yet thought it proper to give a name to this earth. I (hall wait till its pro- 

 perties are better Icnovvn •, befides which, i fhoukl be glad to have the advice of my brother- 

 chemifts on the fubjc£l *. 



In a fecond memoir, I fliall fpeedily give the moft complete account in my power, of its 

 combhiarions with the acids and feme of the combultible bodies |. 



F. 



X. 



Defcription of a mwiiiveHied deiached Efcatetnent for Poclet Watches^ is'c. 



By Mr. John Prior %. 



I G. I and 2, Plate XV, reprefent the principal parts of the efcapement. 



Fig. I. A B, the pillar-plate ; and A B E F, fig. 2, is a feftion of the frame without 

 pillars or potance. C, the cock fcrewed to the potance- plate at D. G, the balance, the 

 lower part of which runs in the plate (but perhaps a potance will be more convenient for it 

 in a pocket watch). H, the regulating fpring, pinned faft in the ftud at I. O, the friiflion 

 wheel. N, its arbor, the higlier pivot of which runs in the collet the balance is rivetted to, 

 and the lower in a collet fcrewed faft on the balance- arbor at P; fo, when the balance 

 turns round, the fri6lion-wheel is taken along with it. 



M, the intermittent lever-wheel. L, its arbor. R, its pinion, in the rim of which wheel 

 are put an equal number of pins on each fide. The pins on one fide of the wheel are put 

 exa<?lly at the middle didance of thofe on the other fide. 



T, the intermittent lever, fcrewed faft to K, its arbor. QJ5.are its banking fcrews. 



The lever is all made of one folid piece of fteel. That end of it next the wheel Is cut 

 open wide enough to receive the rim, without touching either fide of it, as far as the pal- 

 lets or inclined planes are ; at the end of which it is cut wider, to admit the pins of the 

 wheel. {Stcfg. 2, a fe£l;ion of it as under L.) 



The diftance from the centre of the balance to the extreme part of the lever, or end of 

 the pallets, is divided in a right line into ten equal parts, and the pivot-hole of the fridlion- 

 wheel is made at the firft tenth divifion from the centre of the balance. There are thirteen 

 femi-diameters of the friclion wheel from its centre to the end of the pallets. 



When the balance Is at reft, then the centre of the balance, the centre of the frldtion- 

 \vheel,'and the centre of the lever, will be all in one right line. (Seey?g-. i.) 



The lever is divided into three equal parts. The diftance from the end of the pallets to 



• The moft cliarafteriftic property of this earth, confirmed by the lateft experiments of our colleague, being, 

 that it forms falls of a faccharine tafte, we propofe to call it Glucine, from y'Kvx.vq fwccf, yi^xu fwcet wine,. 

 yXiwana to render fweet. This denomination will befignilicant enough to afiift the memory ; it docs not derive , 

 its etymology from a fcnfe too ftriftly dctermiaed ; neither does it prefent ideas falftly exclufive, like thofe 

 name* which might be taken from the name of the ftone which afforded the firft fpEcimen of the new fiibftance, 

 the name of the firft village where it was met with, &c. &;c. Thefe, we apprehend, are the true principles for 

 the advancement of fcience, and facilitating its ftudy, by means of nomenclature. Note of the Editors of the 

 Annales. 



i- Cit. Vauquelin has publilhed an appendix to this paper, on the general properties of this earth, which wiii 

 appear in our next. N. 



% Tranfaftions of the Society for the Encouragement of Arts, 1758. A premium of thirty guineas was 

 given to the inventor. N. 



the 



