A 



JO'URNAL 



OF 



NATURAL PHILOSOPHY, CHEMISTRY^ 



AND 



THE ARTS. 



OCTOBER, 1806. 



ARTICLE I. 



Letter from Richard Lovell Edgworth, Esq. contain* 

 ing a Description of an Odometer for a Carriage, and 

 ^om& Remarks on the Patent Boring Machine of Mr- 

 Ryan. 



To Mr. NICHOLSON. 



Edgeworthstown, Ireland, Aug. a^, 1806. 



Sir, 



JL SEND you a drawing of an Odometer for a carriage. Description of 



which I request you will insert in your Journal when it ^" Odometer, 



,.,.-, or instrument 



IS entirely convenient to you. for measuring 



This Odometer is more simple than any which I have the ground ^ 



seen, is less liable to be out of order, and may be easily P^''^^ ^''^'" ^? 

 ' . , „ , "^ "'OKM.j ^ carnage. 



attached to the axletree bed of a postchaise, gig, or any 

 other carri^e. 



One turn and a hajf of a screw is formed round tbe» 

 nave of one of the hinder wheels by a slip of iron three 

 quarters of an inch broad and one-eighth of an inch 

 thick; this is wound round the nave, and fastened to it 

 by screws passing through five or six cocks, which are 

 turned up at right angles on the slip of iron. The helix: 

 so formed on the nave of the carriage wheel acts as a 

 worm or screw upon the teeth of the wheel A^ upon the 



Vol. XV.— Oct. 1806. M arbor 



