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Updated: June 1, 2025
In like manner, the rise and fall of the tide probably answer to the periodical inundations; and thus the same effects are produced under apparently different but really similar circumstances. The origin, however, of these coatings of metallic oxides, which seem as if cemented to the rocks, is not understood; and no reason, I believe, can be assigned for their thickness remaining the same.
The oxidation process will not always occur as intensely as by a paper roof, ten years old and painted two years ago, which instigated above described experiment. As long as the roofing paper is fresh and less porous, especially if the occurring pores are filled and closed again by repeated coatings, oxidation will take place far less rapidly.
The bulbs were then sealed off and separately tried. The brightness of the filaments was now such as would have been expected on the supposition that the energy given off was proportionate to the surface of the bulb, this surface in each case representing one of the coatings of a condenser.
This, which we may term the original heat, is constantly flowing forth into space, but makes its way slowly, because of the non-conductive, or, as we may phrase it, the "blanketing" effect of the outer rock. The effect of the strata is the same as that exercised by the non-conductive coatings which are put on steam boilers.
Adobie dwellings are warm in winter and cool in summer, and can be kept clean and healthy by occasional coatings of lime whitewash. The dugout is even more simple in construction. A cutting, say ten feet wide, is put into the base of a hill for say twelve feet until the back wall is, say, ten feet high, the sides starting from nothing to that height.
A long tube covered with aluminium bronze lights when held in one hand the other touching the terminal of the coil quite powerfully. It might be objected that the coatings are not sufficiently conducting; still, even if they were highly resistant, they ought to screen the gas.
I have heard of instances in which the bitumen coatings have softened under certain circumstances and become quite 'tacky. But, bless my soul! here am I gossiping with you and wasting your time, and it is nearly a quarter to nine!" My guest rose hastily, and I, with many apologies for having detained him, proceeded to fulfil my promise to guide him to his destination.
As regards China, this seems quite exceptional, for there is in the Louvre a piece with the legend 'lou-tinsg, i.e. six coatings, implying that even so many are unusual enough to be worthy of special mention." There is as much difference between different kinds and qualities of lac as between different classes of marquctcrie.
G is an ordinarily constructed alternator, supplying the primary P of an induction coil, the secondary S of which charges the condensers or jars CC. The terminals of the secondary are connected to the inside coatings of the jars, the outer coatings being connected to the ends of the primary pp of a second induction coil. This primary pp has a small air gap ab.
If the carborundum proves useful in connection with these and similar experiments, its chief value will be found in the production of coatings, thin conductors, buttons, or other electrodes capable of withstanding extremely high degrees of heat. The production of a small electrode capable of withstanding enormous temperatures I regard as of the greatest importance in the manufacture of light.
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