CCftVlUNEAlt SAW. 333 



*erally mechanical powers, could such be discovered as 

 TVOuld preclude much mystery and manual labour. 



Considering the subject in a national point of view, as on several nati- 

 connected with our naval yards in the formation of timber; 

 with our military departments, in respect to wheels of 

 fvery description ; with our whale and herring fisheries ; 

 ©ur public and private breweries and distilleries ; our East 

 and West India Companies, and other bodies depending on 

 cooperages, as well as other minor trades peculiarly liable 

 to the evils complained of ; I invented a curvilinear saw, 

 which, with little aid of the most ignorant labourer, an- 

 swers every purpose. 



Having effected these ends, suffer me to solicit the honour 

 of your acceptance of a model, together with a drawing of 

 my saw, sufficiently accurate for the use of those in remote 

 situations to work by, who may wish to use or make 

 {hem, 



I have the honour to be, 

 Gentlemen, 

 Your most obedient and most humble Servant, 



JOHN TROTTER, 



Soho Square, Sept. 12, 1805. 



To the Society for the Encouragement 

 of Arts, &c. 



Reference to the Engraving of Mr. Trotter's Curvilinear 

 Saw. Plate X. 



Pig. 1. Represents a bird's eye view of the saw and ma- Description #f 

 chinery. The dotted lines show the spindle «, moving on one * 

 two centres £, b, having at one end a pulley c, and at the 

 other a concave saw d (with a corresponding convexity to 

 the curve required to be sawed,) secured on the convex side 

 by a collar, and on the concave side by a Joose collar, and 

 screw nut. 



e, e, Two grooved plates, admitting through the top of 

 the bench and fence /, screw bolts fastened by thumb nuts, 

 by means of which, and a parallel motion g, the fence / is 

 regulated, and consequently the Conductor h of the wood i 

 admits it to be sawed through, as represented in the dotted 

 line at any part required. , 



Z4 The 



