196 



KEGBETTI AND ZAMBRA, HOLBOEN VIADUCT, B.C. 



FIG. 562. 



FIG. 563. 



29 



28- 



97- 



26- 



25- 



24- 



23- 



22 



*/ 



20 



19 



18 



17 



16 



15- 



H 



IS 



)2 



JO 



6^ 



l? 3 4 r 



ife 



3 



-14 

 -13 

 -1Z 

 -11 







HO 

 I-T 



-2 o 



FIG. 559. 



FIG. 564. 



Each 

 s. 



2 2 

 2 10 



MERCURIAL VACUUM GAUGES. 



559 Vacuum Gauge, in Mahogany or Oak frame, form as fig. 459 . 



560 Ditto ditto in Plain Brass frame . 



561 Marine Vacuum Gauge, in Oak frame, iron cistern, stout glass tube, 



gun metal unions, and OPAL GLASS SCALES, divided to 1- 100th 



of an inch . 440 



562 Vacuum Gauge, The tube and scale are enclosed in stout Glass 



cylinder and Brass frame, with stop-cock and union (fig. 562) . 1 10 



563 Sugar Pan Vacuum Gauge, as above, in Brass case, with Hinged 



Door, ground plug, fitting with Stop-Cock, &c. (fig. 563) . . 2 10 



564 Vacuum Gauge, to show 30 inches, in handsome Mahogany case, 



with plate glass front, adjusting glass cistern, Gun Metal Tap, &c., 



suited for First-class Engine Rooms (fig. 564) . . . .550 



For Circular Vacuum Gauges, see Bourdon's Gauges, pages 206 to 209. 



