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When dipping for foundation seven Langstrotli sheets (1^'\ inches x 

 8 inches) to a pound, the temperature indicated by the thermometer 

 should be 155 to 160 degrees, for eight sheets to a pound 165 to 168 

 degrees, and for section foundation 170 to 174 degrees, and the number 

 oi plain sheets in a 5-lb. pack, before trimming, about 28, 33 and 38 

 resp)ectively. 



The foundation mill, as seen in the illustration Fig. 4, consists of 

 two type metal rollers on steel spindles, one above the other, running in 

 bearings set in the cast-iron frame-work. To the projecting axle of' the 

 lower roller a crank handle is attached, by means of which, and the cog 

 wheels at each end of the rollers, the latter are revolved. The bearings 

 of the lower roller are fast in the frame, while those of the upper one 



Fig. 4. — Rolling the Sheets. 



are capable of being raised or lowered and moved sideways. Rubber 

 cushions, or, in the latest machines, steel springs, between the upjjer and 

 lower bearings hold the rollers apart, the closer setting being accom- 

 plished by means of two vertical set screws, which force down the upper 

 bearings and thus bring the rollers together. 



It is absolutely necessary that the rollers should be perfectly parallel, 

 both vertically and horizontally, otherwise good workmanship cannot 

 be expected in the sheets of foundation. The horizontal adjustment is 

 made with the vertical set screws, while the top roller is set true to the 

 lower one, vertically with four lateral set screws at each end. By means 

 of these screws the bearings can be moved slightly sideways. The 



