No. 52 796. 



Station Barometers. Aneroid Barometers. 



375 



52791. 1:3. 



52 792. 1 : 4. 



52 794. 1 : 4. 



52 795. 1 



52 796. l 



52.790. Travelling ana Altitudinal Barometer after Gay-Lussac, Figure, syphon baro- 

 meter, with two verniers, giving 1 /io th mm, with thermometer, stand, and universal 

 suspension and with leather case 



52.791. Bourdon's Tube, on stand, Figure, with pointer and scale, for placing on the 

 vacuum pump, for explaining the principle of the Aneroid Barometer 



52.792. Aneroid Barometer (Holosterical Barometer after Vidi), Figure, excellent mecha- 

 nism, mounted open, 100 mm scale diameter, with glass plate, glass bell and rubber 

 tubing with mouthpiece 



If the air under the glass globe is compressed or rarified by blowing through or applying suction 

 to the mouthpiece, the barometer gives these variations. 



52.793. - - idem, scale 130 mm 



52.794. Demonstration Aneroid Barometer for the Vacuum Pump, Figure 



52.795. Demonstration Aneroid Barometer, after Weiler, Figure 



52,796. Demonstration Aneroid Barometer, Figure, for suction, with rubber tubing and 



mouthpiece, covered by glass bell, can be used horizontally and vertically 



The instrument works very well and can be recommended. 



Cathetometers for accurately reading Barometers: see 

 Nos. 51,46351,466, p. 224. 



s. d. 

 7.10. 



1. 2.0 



2. 4.0 



2.10. 

 2.10.0 

 2.10. 



1.10.0 



C]. 870, 872,3345, 

 4699, 873. 



