74 [Assembly 



the material so formed as lo produce a bruncaiecj semi-cycloidal face 

 inwards, while above, below, or at the edge of the horse wheel, ihere 

 are shafts placed, which, when horizontal, have their gudgeons in le- 

 vers, set with the fixed fulcrums a short distance from the gudgeons, 

 and the longer arms weighted so as lo allow a vibratory motion in 

 the shafts and gudgeons, and on the shafts thus fitted, Mr. Scripture 

 has fixed what your committee think may be termed " blank pinions," 

 formed as follows : — 



A disk of metal is cast convex externally and concave internally, 

 forming an open shell, whose edges are made sectionally, nearly in 

 the same shape as the grooves in the horse wheel, but a little thicker 

 near the edges of the grooves ; and just outside this part, an annular 

 groove receives a cover plate, a hole of the proper size, through both 

 parts, enables the workmen to wedge or key them on the shaft, so thai 

 tlie thickest part of each pinion shall run in and fit tight on the edgea 

 of the groove in the horse wheel, which, when put in motion, carries 

 the pinions and shafts with it, by the adhesion of the parts in contact. 

 In situations where metal " blank pinions" cannot be obtained, wood, 

 put in the same shape, will answer the same purpose so long as they 

 will stand the work. Your committee agree, that the value of this ar- 

 rangement lies in the following points : 



First. The facility with which the most ordinary workman can con- 

 struct such a machine, in'any place where he can get the wood and 

 tools ; as the whole may be keyed and pinned together with wood, 

 and made with wood gudgeons, where iron cannot be had, and from 

 the way in which the shafts are held, in vibratory levers, if the horse 

 wheel, from haste, shrinkage, warping, or hard work, ''gets out of 

 truth," the shafts and levers will so accommodate themselves to any 

 iindulatory motion in the wheel, that the work required can still be 

 progressed with. 



Second. A well made wheel and pinions will last many years with- 

 out repairs, and if the wheel grooves get worn wider, a packing plac- 

 ed between the annular ring and cover plate of the pinions, will 

 spread the pinion, to fill out the worn space, and make the parts ef- 

 fective again. 



Third. The advantage your committee considers the most impor- 

 tant, is a greater security from injury by accident or design than they 

 have seen in any machine of equal power ; for, if the levers and 



