( 138 ) 
MEMOIR 
ON A NEW SYSTEM OF 
COG OR TOOTHED WHEELS. 
BY 
MR. JAMES WHITE,* 
ENGINEER. 
COMMUNICATED BY T. JARROLD, M. D. 
(Read Dec. 29th, 1815.) 
Tue subject of this paper, though merely 
of a mechanical nature, cannot fail to interest 
the Philosophical Society of a town like 
Manchester, so eminently distinguished for 
the practice. of mechanical science ; unless as 
J fear may be the case, my want of sufficient 
theoretic knowledge or of perspicuity in the 
explication, should render my communication 
not completely intelligible. To be convinced 
of the importance of the subject, we need 
only reflect on the vast number of toothed 
wheels that are daily revolving in this active 
and populous district, and on the share which 
* N.B. A patent was taken out for the Invention some 
years ago. 
