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Nature might at least have paused to shed one tear over this rough jacketed little son of hers, for his wasted aims, his cancelled ambitions, his whole career of usefulness cut suddenly short. But not a bit of it! Jubilant as ever, her song went bubbling on, and "Death-in-Life," and again, "Life-in-Death," were its alternate burdens.
Sometimes he would not cry; but when he was caught in one of his frequent offences and called up before the teacher's desk in the face of the whole school, and whipped over his thinly jacketed shoulders, he would take it without wincing, and go smiling to his seat, and perhaps be called back and whipped more for smiling.
For one of my own purposes I need hot-water pipes, having very little variation in temperature night and day; and using coke for economy's sake, I get a regular temperature by heating a large quantity of water, about 200 gallons, with the fire, and inclosing this in a tank jacketed with slag wool.
Wool, silk, and cotton are much diminished in conducting qualities when spun and woven, for the reason that their fibers are brought closer together. Count Rumford discovered that hot water, at a given temperature, when placed in a vessel jacketed with a clothing of twisted silk, and plunged into a freezing mixture, cooled down to 185 deg. Fah. in 917 seconds.
The might-have-been took him by the throat. He descended into the engine-room to hide his dejected face in the heated oily atmosphere below; and seating himself on a tool-chest he watched, with hardly seeing eyes, the ponderous movement of his machinery. It was the anodyne for his troubles, to feel the vibration of the engines and hear the rumble and hiss of the jacketed cylinders.
The cylinders of this first Wright engine were separate castings of steel, and only the barrels were jacketed, this being done by fixing loose, thin aluminium covers round the outside of each cylinder. The combustion head and valve pockets were cast together with the cylinder barrel, and were not water cooled.
In the modern turbine a glowing coal fire, kept intensely hot by an artificial draft, has taken the place of the blazing sticks; the coils of steel tubes carrying the boiling water surrounded by flame replace the bronze-figure boiler, and the whirling, tightly jacketed turbine wheels, that use every ounce of pressure and save all the steam, to be condensed to water and used over again, have grown out of the crude machine invented by Branca.
Now, all together please ..."; and the row of self-conscious boys bowed, gloved hands upon severely jacketed chests, while as many little girls, aware of doing the thing correctly and of not looking fools in the doing of it, spread white tarletan skirts in starchy semi-circles by way of reply. It was the weekly dancing class, when Mr.
Several screws hold lining and barrel together. To promote efficiency, the furnace and boiler is jacketed with asbestos or fire-clay round the furnace secured by a thin outer cover. The enclosing is a somewhat troublesome business, but results in much better steaming power, especially in cold weather. Air-holes must be cut round the bottom of the lining to give good ventilation.
Oh, our guards were brutes! And under their treatment we had to harden to brutes in order to live. Hard work makes calloused hands. Hard guards make hard prisoners. We continued to talk, and, on occasion, to be jacketed for punishment. Night was the best time, and, when substitute guards chanced to be on, we often talked through a whole shift. Night and day were one with us who lived in the dark.
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