^i6 On an Efcapement. — Forte of Aknt 



IX. 



On the^knt Efcapement of Mr. Goodrich. By a Correspondent. 



To Mr. Nicholson. 

 Sir, 



X WAS much pleafed with the fimple efcapement of Mr. Goodrich, defcribed in youT 

 laft number, and in common with the refpeflable Society tor the Encouragement ot 

 Arts, and yourfelf, and I doubt not the Inventor alfo, thought it as new as it is ingenious. 

 But as I have fince met with the fame Invention, I fend you the following notice, and 

 fuppofe you will join me in opinion that Incidents refpefting Improvements in the Arts 

 have a claim for infertion in your mifcellany. 



In the Volume oi Machines et Inventions approuvits par V Academic royak des Sciences , 

 lome viii. page 325, there is an account, with an engraving, of a Crank Efcapement, 

 invented in the year 1746, by L'abbe Soumille, and a Report explaining its qualities and 

 advantages at length, by Meffrs. Hamel and Camus. 



I am, Sir, your obliged fervant, 



One of the Public. 

 London, izth Nov. lygg. 



X. 



Refults of various Experiments for determining the Quantity of A^ion rvhich Men can 

 afford by their Daily Work, according to the different manners m whitk they employ 

 their Strength. By Citizen Cov LOUS.* 



O give a clear and precife account of this intereftihg memoir, itjs in the firft 

 place neceffary to fix the meaning of the words quantity of aSian. 



The effeft which refults from the mechanical labour of men can always be reduced 

 to the afcending motion of an heavy body. The velocity with which fuch a body 

 afcends, would foon be deftroyed, if the caufe that produced it were to difcontinue it»- 

 aftion ; and it is neceffary that the man ftould make a continual effort to keep it up. 

 Here, therefore, are two quantities capable of numerical enunciation ; the velocity 

 which is the number of metres or unities of fpace uniformly pafled over, during \hm 



* Communicated to the National IntlituW of France, and abridged by Primy, in the Bulletin de la See. 

 Philomath. No. 16. Meflidor, Aug. 6. 



unitj 



