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Updated: June 22, 2025
Even such apparent exceptions as vulcanite, an excellent insulator, fall into the law, since, as Graham Bell has recently shown, this substance is remarkably transparent to certain kinds of radiant energy. In 1778, Brugmans of Leyden noticed that if a piece of bismuth was held near either pole of a strong magnet, repulsion occurred. Other observers noticed the same effect in the case of antimony.
Knowing the latter to be extremely sensitive to minute changes of pressure, for example, those of sonorous vibrations, he conceived the idea of measuring radiant heat by causing it to elongate a thin bar or strip of metal or vulcanite, bearing at one end on the button. To indicate the effect, he included a galvanometer in the circuit of the battery and the button.
It is almost needless to remark that the disk, D, and the pin, E, are composed of insulating material, such as vulcanite. Jour. Gas Lighting. By J.W. PRATT, F.C.S. It frequently happens in the laboratory that platinum vessels, after long-continued use, begin to show signs of wear, and become perforated with minute pinholes.
The new apparatus is an addition to the world's wealth, not because so many scraps of wood, brass, nickel, vulcanite, and such and such lengths of wire are shaped, stretched, and connected with sufficient manual dexterity for the highest dexterity is very often employed in the making of contrivances which turn out to be futile but because each of its parts is fashioned in obedience to certain designs with which this dexterity, as such, has nothing at all to do.
For instance, Bickley's medicine-case which lay open showing the little vulcanite tubes, a few instruments and other outfit, engaged his particular attention, and I saw at once that he understood what it was. Thus his arm still smarted where the needle had been driven in and on the blanket lay the syringe. He looked at his arm, then looked at the syringe, and nodded.
There is an idea abroad in these days that it is too soft and dead for the purposes of the new rubber-cored ball; and the impression that the latter likes the very hardest surface it is possible to apply to it has resulted in horn, vulcanite, and even steel faces being fitted to drivers and brassies.
In those days Greek was compulsory, but not more so than two pipes in a case. One of the pipes had an amber stem and the other a vulcanite stem, and both of them had silver belts. That also was compulsory. Having bought them, one was free to smoke cigarettes. However, at the end of my first year I got to work seriously on a shilling briar, and I have smoked that, or something like it, ever since.
It is reported that on another trial the light from the star Arcturus, when focussed on the vulcanite, was capable of deflecting the needle of the galvanometer. When gelatine is substituted for vulcanite, the humidity of the atmosphere can also be measured in the same way. Edison's crowning discovery at Menlo Park was the celebrated 'phonograph, or talking machine.
If a man, who is a good and steady driver, makes several drives from the tee with a club which has a leather face, and several more with another possessing a steel or vulcanite face, I am confident that he will on the average get at least as far with the leather as with the other, and I shall be surprised, if the test is fair and reliable, if he does not get further.
One of our water-bottles was emptied before the storm began, but the other, a large, patent flask covered with felt, and having a screw vulcanite top, should still contain a good quantity, perhaps three quarts that is, if the fluid had not evaporated in the dreadful heat. If this had happened, it meant that Higgs would die, and unless help came, that soon we should follow him.
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