370 



Equilibrium of Gases. 



NCI. 



SS 746. 1:14. 



52 747. 1 : 10. 



58 749. 1 : 9. 



52752. 1:12. 



52,746. Vacuum Gauge, after MacLeod, Figure (Ztschr. f. Instrumentenkunde, 15, 1895, 

 p. 191), for measuring high vacua. Price without mercury ............ 



This instrument is absolutely necessary when exhausting Geissler and Rontgen Tubes. The Oil 

 Vacuum Pumps and Mercury Vacuum Pumps supplied by us are tested exclusively \vith this instrument. 

 The Vacuum Gauge has a measuring bulb of 500 cem capacity and it permits of measuring high vacua 

 th mm with accuracy. About 7 kg mercury is necessary for filling. 







3. 15. o 



to 



52.747. Vacuum Gauge, after MacLeod, smaller and simpler, on wall board," Figure, without 

 mercury ................................... 



About 2 kg mercury is necessary for filling. 



52.748. Barometrical Pressure Gauge (Differential Barometer), after Eegnault-Leduc, con- 

 sisting of a mercury barometer and a pressure gauge having common vessel, suitable 

 for readings with the cathetometer (Gan.-Man., Fig. 158) ............. 



52.749. Barometer Tube, without graduation, with cast iron mercury cup, for Torricelli's ex- 

 periment, Figiire (M. T., p. 116). Without mercury ............. 



52.750. - - idem, with etched graduation, glass stopcock at lower end and iron cistern . 



52.751. Barometer Tube, piece of Rubber Tubing and short piece Tubing (Meyer, Naturli-hre, 

 Fig. 166) ................................... 



52.752. 3 Barometer Tubes in mercury trough, Figure, with stand (M. P., HI, Fig. 236 

 [II, 2, Fig. 108]), for showing the difference between gases and vapours ...... 



52.753. - - i d e in, tubes having etched graduation, with funnel-shaped opening and half- 

 perforated stopcocks on the upper end, for conveniently introducing the liquids to be 

 evaporated .................................. 



1. Hi. o 



8. o. o 



0. .'!. o 

 <>. <.<> 



0. 2. 6 



1. Hi. n 



2. it. n 



(.'I. 967, 968. 853, 856 



