198 NEGRETTI AND ZAMBRA, HOLBORN VIADUCT, E.G., 



ini 



FIG. 565. 



FIG, 575. 



FIG 573. 



Each 

 s. d. 



573 Steam Engine Indicator, in gun metal, for ascertaining the amount 



of power exerted during any part of the stroke, Low Pressure 



(fig. 573) 550 



574 Ditto ditto . . . . High Pressure 660 



575 Richard's Indicator with one Spring (fitted with Darke's Patent 



Detent and Cord Adjuster) fig. 575 8 10 



576 Extra Springs, ten varying scales each 10 



577 Paper Cylinder Spring 016 



578 Arrangement for Oscillating Engines 10 



579 Metallic Paper per packet 040 



580 Treatise on Indicator New Edition 090 



581 Extra Stop Cock 080 



582 A 3-way Cock for taking diagrams from top and bottom of cylinders without 

 shifting the Indicator made to order. Connecting Pipes made to order. Elbow 

 for attaching the Indicator to Horizontal Engines made to order. 



583 Reducing Gears, for reducing the stroke of the Engine down to that of the 



Indicator. Made to order. 



584 Small size with Pulleys for strokes varying from 4 ft. 6 in. down to 1 ft, 6 in., 

 price, 4 17s. 6d., can be attached direct to the Indicator. 



Larger size for strokes from 6 ft. down to 1 ft. 6 in., 5 17s. 6d. 

 These instruments are packed in mahogany cases with their necessary 

 attachments. 



585 Old Indicators (Richard's), fitted with Detent at . . . . 1 10 



586 Patent Cord Adjusters . . . .... . .056 



