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A coil of platinum or platinum-alloy wire is enclosed in a suitable fire-proof case and put into the furnace of which the temperature is wanted. Connecting wires, properly protected, lend from the coil to a differential voltameter, so that, by means of the current from a battery circulating in the system, the electric resistance of the coil in the furnace can be determined at any moment.
So when the day came Uncle Ted took Patty over to New York, and Bob and Bumble and Nan went too, and it was a group of very long-faced young people who met Mr. Elliott at the appointed time and place. But Bob said: "Brace up, girls, we're not losing our Patty forever. She'll spend next summer with us at the Hurly-Burly, and by that time well have beautiful new fire-proof stairs."
The little laconicum is best covered with a flat vault, the soffit being of glazed bricks, and the springing being brought down below the main ceiling level. Fire-proof floors over hot rooms may be of any design that is also heat-proof. The main point is to have a sufficient thickness of concrete, and the iron joists and cross girders well buried therein.
Some have been built fire-proof throughout, with only stone, brick, concrete and iron material, even to the floors and window casings. Many more have had iron shelves and iron stacks to hold the shelves constructed, and there are now several competing manufacturers of these invaluable safeguards to books.
These fire-proof cloths were actually produced, said to be made of salamander's wool, though the knowing ones detected that the substance of which they were composed was asbestos, a mineral, which is in fine filaments capable of being woven into a flexible cloth.
Morley, followed by half a dozen Mowbray lads and two chosen Hell-cats, leaving all the confusion below, had ascended the great staircase, traced his way down a corridor to the winding steps of the Round Tower, and supplied with the necessary instruments had forced his entrance into the muniment room of the castle. It was a circular chamber lined with tall fire-proof cases.
While the northern kingdom was rapidly descending into the pit of destruction, a mighty upward impulse was given to Judah, both spiritually and materially, by its king Hezekiah. In his infancy the king had been destined as a sacrifice to Moloch. His mother had saved him from death only by rubbing him with the blood of a salamander, which made him fire-proof.
"Hundreds of 'em," said Jasper, pressing the red-hot tobacco into the bowl of his pipe with the end of his little finger, as slowly and coolly as if his flesh were fire-proof. "I don't know, exactly, how many they've got. I doubt if anybody does, but they have them all over the country.
Sure also was he that he was just upon the point of a practicable success. Give him but an oven, and would he not turn you out fire-proof and cold-proof India-rubber, as fast as a baker can produce loaves of bread? Nor was it merely the hope of deliverance from his pecuniary straits that urged him on. In all the records of his career, we perceive traces of something nobler than this.
There was one four-story fire-proof building that was stored full of the most valuable goods, at a large price for storage, for it was considered absolutely fire-proof, but when the fire came the heat of the fire from the buildings around it caused the iron sides of it to expand, which let the roof fall in and burned every thing to the ground, so that nothing was saved.
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