CALICO-PRINTING 



595 



similar purpose in the longitudinal direction, the tool bar may be made to shift in its 

 sliding frame with an adjusting screw attached to it, by means of which any degree 

 of exactitude in the setting of the tools may be obtained. 



In the machine, as shown in the accompanying drawings, the design executed on 

 the cylinder would bear the same proportion in size to the enlarged pattern on the 

 bed or table that the small drum ml bears to the large wheel /, and the radius of the 

 discs g g, to the radius of the circular bed ; but by the adoption of wheels and discs 

 of different diameters, any desired proportion between the pattern engraved and the 

 enlarged pattern may be adopted. 



By minor improvements, an alternate reverse action is given to the tools and bars, 

 thus adapting the machine for turnover patterns ; also more than one row of points 

 may be attached to each bar. In 1857 William Shields patented a machine in which 

 he substituted a flat table for the curved table of Whipple and Eigby, and applied an 

 ingenious and original method of varying the dimensions of the design on the zinc plate 

 in transferring it to the roller. The tracing instrument communicates motion to the 

 etching tools through the intervention of inclined planes, so that by varying the angle 

 of these planes motion is transmitted in the required proportion ; motion is communi- 

 cated to the cylinder through similar apparatus. The remarkable facilities offered by 

 this machine caused its immediate adoption by Messrs. Lockett, Leake, and Co., of 

 Manchester, by whom it has been most extensively used in their own works, ancf 

 manufactured for the trade in England and on the Continent. A reference to th, 

 annexed diagram will more clearly show the peculiarities of this machine. 



Fig. 337 is a longitudinal section of the machine ; fig. 338 is a plan-view. The 

 framework of the machine is shown at a, provided with a table b, upon which is placed 



337 



the design to be copied. The tracer c is jointed upon a rod d, which rod d passes 

 freely through a bar e, and between slides /, mounted upon the said bar, which there- 

 fore act as guides when the rod is moved to and fro in the direction of its length. 

 This rod d is attached atone end to a cross-bar g, carried by parallel bars h, which rest 

 upon flanged rollers i, capable of rolling upon fixed rails k ; as therefore the tracer c and 

 bar d are moved longitudinally, the bar </ and its parallel supports are caused to par- 

 take of a like motion. To the bar h is fixed a bracket I, which carries at its upper 

 end a stud m, projecting into a groove formed lengthwise in a lever n ; this lover is 



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