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Updated: September 10, 2025
But what a splendid and useful building has been placed on this foundation by Clausius and Maxwell, and what a beautiful ornament we see on the top of it in the radiometer of Crookes, securely attached to it by the happy discovery of Tait and Dewar, that the length of the free path of the residual molecules of air in a good modern vacuum may amount to several inches!
'You might stay here, Dewar, and I'll have a look out and see if there's a chance of getting forward to give a hand. The other doctor offered to go if the other would wait, but his offer was quietly put aside. 'I'll get back in an hour or two, the captain said, and went off. Dewar and the chaplain stood in the door and watched him go.
* For a strong statement of the new critical position see Dewar and Finn's "Making of Species," 1909, ch. vi. The origin of the metamorphosis, or pupa-stage, of the higher insects, with all its wonderful protective devices, is so obscure and controverted that we must pass over it.
Something, then, must be done to insulate the liquefied gas, else it will retain the liquid state for too short a time to be much experimented with. How might such insulation be accomplished? The most successful attack upon this important problem has been made by Professor Dewar.
It is obvious that the length of the mean free path of the molecules of a gas may be increased indefinitely by decreasing the number of the molecules themselves in a circumscribed space. It has been shown by Professors Tait and Dewar that a vacuum may be produced artificially of such a degree of rarefaction that the mean free path of the remaining molecules is measurable in inches.
He stayed there until a message reached him by one of the stretcher-bearers who had been back to the dressing station that he was badly needed there, and that Mr. Dewar hoped he would get back soon to help them. Certainly the dressing station was having a busy time. The darkness had made it possible to get back hundreds of casualties from places whence they dare not be moved by day.
In general, their cohesion is greatly increased, and the dilatation produced by slight changes of temperature is considerable. Sir James Dewar has effected careful measurements of the dilatation of certain bodies at low temperatures: for example, of ice. Changes in colour occur, and vermilion and iodide of mercury pass into pale orange.
The work of Professor Dewar has perhaps been the most comprehensive and varied, but the researches of Pictet, Wroblewski, and Olzewski have also been important, and it is not always possible to apportion credit for the various discoveries accurately, since the authorities themselves are in unfortunate disagreement in several questions of priority.
Among these, as Professor Dewar discovered, is liquid oxygen itself. Thus if a portion of liquid air be further cooled until it assumes a semi-solid condition, the oxygen may be drawn from the mass by a magnet, leaving a pure nitrogen jelly.
Dewar as well as the burglar who had broken into Stamper's house, it was part of his plan to acknowledge himself guilty of the latter crime and use it to justify his movements before and after the murder. Bain is more convincing when he states at the conclusion of his letter that he had known Mrs.
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