No. S3 764. 



Vacuum Gauges, Pressure Gauges, Barometer Tubes. 



371 



52 754. 1 : 7. 



52756. 1:10. 



52 758. 1 : 10. 



52762. 1:15. 



52.754. 4 Barometer Tubes, of 15, 12, 8 and 6 mm width, Figure, for showing that the 

 height of the barometer is independent of the width of the tubes, but that the meniscus 

 influences the reading to a greater extent in the case of narrow tubes than in the case 

 of wide; with etched graduation (in millimetres at the upper end) and one iron trough, 

 iron stand with ribs for removing the tubes laterally 



One of the tubes is provided underneath with a stopcock for securing ease of manipulation in 

 the general experiments on the Torricellian vacuum. 



52.755. - - idem, without graduation 



52.756. Demonstration Barometer Tube, after Kolbe, Figure (Ztschr. f. d. phys. u. chem. 

 U. 6, 1893, p. 31), of glass, with two stopcocks and glass vessel 



"'-.757. - - idem, with one platinum electrode in the upper part . . 



52,758. Barometer Tube, with 80 cm long iron tube vessel, .Figure 



.">:.'. 759. -- idem, the glass tube, however, being fitted above with stopcock and etched 

 graduation 



52,700. Tripod Stand, of wood, for barometer tubes Nos. 52,758 and 52,759 



:>L'.761. Barometer Tube, with iron tripod stand (cf. M. P., I, Fig. 472 [513]), cf. Fig. 52,762; 

 the tube graduated, without tube holder and index, and without cock 



:>L'.762. -- idem, with Tube Holder and Index, Figure 



52,763. Duplex Barometer, suitable for explaining the Syphon (Fr. phys. Techn. I, 2, Fig. 2558), 

 with one vessel 



"u.764. - - idem, with two vessels, for two liquids (Fr. phys. Techn. I, 2, Fig. 2559, see 

 also Ztschr. f. d. phys. u. chem. U. 14, 1901, p. 347) 



s. d. 



2. 2.0 



1. 12. 



0. 15. 

 0.18.0 

 0.14.0 



1. 0.0 



0. 8.0 



1.10.0 

 1.16.0 



0. 8.0 

 1.10.0 



Cl. 857, 3343, 854, 4538. 



24* 



