turer alluded to the The improvement has been patented by Mr. Charles uses to which liquid air had been put in estab- J. Billwiller, Nos. 31 and 33 Walker Street, New York lishing and confirming the refractive indices City, and is especially designed to facilitate the dis- of oxygen air and… … the conductivity of a vacuum tube? Yes; it had. All the vacuum tubes which Professor Dewar painted with liquid air at once began to resist the passage of electricity through .them, be kept clean and in good condition, and yet permit orout. The dumping of the car is effected by guides because the…
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![An illustration from Embroideries and laces : values that sell : season 1913 : [catalogue]. -- (1913)](https://img.insideoutlibrary.com/img/200/ia-embroiderlaces00mackuoft-54-0.webp)
