A 



JOURNAL 



OF 



NATURAL PHILOSOPHY, CHEMISTRY, 



AND 



THE ARTS. 



JUNE, 1812. 



ARTICLE I. 



A Description of the Smicrologometer for ascertaining the 

 Tenacity of Metals, Silk, Cotton, and Linen Threads, fyc. 

 invented by Mr. E. Lydiatt, Professor of Mechanics, 

 and Lecturer on Metallurgy and Manufactures, fyc* 



To W. NICHOLSON, Esq. 

 Sir, 



I 



N the course of much practice in the application of metals Tenacity of 

 to the purposes of delicate machinery, I have frequently ^% S fcT >,tth 

 found it necessary to ascertain their comparative tenacity; known, 

 and also of alloys, in different proportions of combination. 



To do this, I have adopted the process employed by and sought by 

 Muschenbroeck and other foreign experimenters on this of^«j^ SWn 

 subject; that is, by drawing the metals, to be subjected to from wires. 

 experiment, into wires of a given thickness, and then sus- 

 pending them vertically by one extremity, while weights 

 were attached to the other ; which weights were increased 

 by fractional additions, till a separation of the particles took 

 place. 



The results obtained, however, by these experiments, I The results not 

 never found satisfactorily correct, on account of the rm- satisfactory. 

 possibility of increasing the weight attached by sufficiently 



Vol. XXXII. No. 147.—June 1812. G small 



