THE ATTAINMENT OF VERY LOW TEMPERATURES 



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Fig. 3. — Apparatus for liquefying air. 



/^, had a disc of the vulcanized fibre between each horizontal helix, 

 the other, B, had not (fig. 2). During the experiments the coil in 

 use was placed inside a vacuum vessel, as in figure 3, arrangements 

 being made for measuring the air passing through the apparatus, and 



