1H08] on the Nadir of Temperature and Allied Problems. 



419 



by a charcoal bulb C. The vacuum so obtained is such that both 

 little bulbs will hold hquid air without appreciable ebullition. 



Eelative Viscosity of Air at the Ordinary axd Liquid 

 Air Te^iperatures. 



Referring to Fig. 4, A is a U-shaped quill tube filled with cotton 

 wool and connected bv stopcock D to B, which is a very fine capillary 

 tube, drawn out in the blowpipe. C is an ordinary aluminium electrode 



'•^^u..o^^ 



r 



Fig. 4. 



Sparking tube, used as manometer for indicating pressure in the 

 apparatus by the alteration in the appearance of the electric discharge. 

 E and F are stopcocks for exhausting the apparatus and connecting it 

 to the charcoal condenser G. A is kept immersed in liquid air tu 



