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Off in emptiness the many-colored mass of Earth shone hugely, rolling past. Innumerable incurious stars looked on. The sun flamed malevolently. The moon floated abstractedly far away. Mike was bent above a small round airlock door. He had a distorted half-cylinder of sheet tin between his space-gloved hands. It reflected a line of intensified sunlight to the edge of the airlock seal.
The Germans further displayed that ingenuity in fancy stops Mersenne had attributed to them in harpsichords more than a hundred and fifty years before, by a bassoon pedal, a card which by a rotatory half-cylinder just impinging upon the strings produced a reedy twang; also by pedals for triangle, cymbals, bells, and tambourine, the last drumming on the sound-board itself.
In the first of these the dust and mud are removed, in the second the blacking is spread on, and in the third the final polish is obtained. In order to guide the blacking to that part of the brush which is to receive it, Mr. Audoye protects the lower part of the latter by a half-cylinder of sheet iron.
We took the thick hide cover from the couch and, one on each side, lifted the vessel of liquid metal and filled our mold. In an hour it was hardened into a bar the shape of a half-cylinder. We removed it and poured in the remainder of the gold. It would appear that the gain was hardly worth the pains, and I admit it.
The descending edges of a row of these flat plates, as they lay side by side, were turned up into a kind of flange of about 2-1/4 inches in height, so that at the points of contact a ridge was formed down the roof. Over this line was laid a series of other tiles shaped into a half-cylinder, the lower end of each tile overlapping the next.
Ahead, Mother Corey's reared up a huge, ugly half-cylinder of pitted metal and native bricks, showing the patchwork of decades, before repairs had been abandoned. There were no windows, though once there had been; and the front was covered with a big sign that spelled out Condemned. The airseal was filthy, and there was no bell. Gordon kicked against the side, waited, and kicked again.
In geometry he gave the first solution of the problem of the two mean proportionals, using a wonderful construction in three dimensions which determined a certain point as the intersection of three surfaces, a certain cone, a half-cylinder, an anchor-ring or tore with inner diameter nil.
And finally the ugly half-cylinder of patched brick and metal that was the old Mother Corey's Chicken Coop showed up against the faint light. He moved in cautiously, as silently as he could, and located the semi-secret entrance to the building without meeting anyone. Once in the tunnel that led to the building, he felt a little safer.
This, if we were not watchful, would be a very frequent cause of failure in our attempts at artificial rearing. But, once the danger has been perceived, the remedy is simple. I make a ceiling over the cavity by laying a short strip of paper above it. If I want to see how matters are progressing, I bend the strip into a semicircle, into a half-cylinder with open ends.
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