MR. JACOB'S INVENTION. 163 



CHAPTER XXX. 



mr. Jacob's invention. 



Various contrivances have been devised by coach- 

 builders, to enable coaches and other four-wheeled 

 carriages to turn shorter than the common coaches, 

 without causing the forewheels to touch the perch. 

 The crane-necked perch is one ; another is the follow- 

 ing contrivance of Mr. Jacob, of Greek Street, Soho, 

 (1810). 



The diagram on p. 164 represents Mr. Jacob's inven- 

 tion : — 



a is the perch as in a common coach, b the piece 

 carrying the springs, and f the piece supporting the 

 traces bolted across the perch at right angles, a is the 

 perch bolt which does not pass through the axletree 

 itself, but through a piece of wood, g, projecting per- 

 pendicularly from the middle of the axletree, about half 

 the diameter of the fore-wheels, and is firmly fixed to it 

 by bolts and straps of iron. The axletree h, is straight 

 on the upper side, and has a straight edge of iron 

 screwed on the top of it, on which the end of the perch 

 a is supported ; the under side of the perch is also faced 

 with iron where it lies upon the axletree. 



M 2 



