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Updated: June 10, 2025
Tait and Dewar have calculated that, in a good modern vacuum, the length of the free path of the remaining molecules not taken away by the air-pump easily reaches a few centimetres. This result is not an hypothesis but a very great probability.
Partial evidence to the same effect had earlier been alleged by Lockyer, as well as by Liveing and Dewar; and the case was rendered tolerably complete by photographs taken by Kayser and Runge in 1889. It was by Professor Rowland shown to be irresistible.
It might therefore have been the case that it pre-existed in the gases extracted from radium; but a remarkable experiment by M. Curie and Sir James Dewar seems to show convincingly that this cannot be so.
Thus the white of egg is very brilliant but the yolk much less so. Milk is much brighter than water, and such objects as a white flower, a feather, and egg-shell glow brilliantly. The most remarkable substances of all, says Professor Dewar, whom I am all along quoting, are "the platinocyanides among inorganic compounds and the ketonic compounds among organic.
Warren, Dewar, Professor J., Evans, Captain Sir F., Flower, Professor W. H., Gladstone, Dr. J. H., Glaisher, J. W. L., Esq., Godwin-Austen, Lieut-Col. H. H., Hawkshaw, J. Clarke, Esq., Henrici, Professor 0., Hughes, Professor T. McK., Jeffreys, Dr.
It was afterwards converted into what in those days was called "Investment Rooms," where they sold all sorts of ladies' requirements and was known as "Old Moores," owing, I presume, to the fact of the proprietor having rather a venerable appearance, and to his having kept the same kind of establishment for many years in Hare Street in the premises now in the occupation of Dewar & Co., the great firm of whisky distillers.
The truly powerful experiments of Professor Dewar are daily adding to our knowledge, while the refined researches of Capt. Abney and others are opening new fields of inquiry. But my object here is to make principles plain, rather than to follow out the details of their illustration.
'I wonder what the victory is costing us? 'Never mind. It's costing t'other side more, sir, said the casualty grimly, and then shut lips and teeth tight on the agony that followed. 'I wish Macgillivray would come, said Dewar when that was finished. 'He could have done it so much better.
When the gas in the bag had diminished by leakage through the valves and elsewhere so that it was no longer sufficient to carry the car, the liquid hydrogen was to be turned into gas which was to take the place of that lost. Ned had left Washington with sixteen cubic feet of the liquid in eight delicate Dewar bulbs, or casks.
All the same, parcels were a great joy to receive, and provided many an excellent tit-bit for supper. Many, unfortunately, went missing especially if they had the labels of Fortnum & Mason, John Dewar, or Johnnie Walker. We sometimes wondered if they were timid and preferred the comforts of the beach to the hazards of the trenches. The canteen arrangements could hardly be called a success either.
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