Add temperature semantics to "F"

src/epub/text/chapter-2.xhtml

@@ -12,7 +12,7 @@
 				<p epub:type="title">The First Making of Cavorite</p>
 			</hgroup>
 			<p>But Cavor’s fears were groundless, so far as the actual making was concerned. On the 14th of October 1899 this incredible substance was made!</p>
-			<p>Oddly enough, it was made at last by accident, when <abbr epub:type="z3998:name-title">Mr.</abbr> Cavor least expected it. He had fused together a number of metals and certain other things⁠—I wish I knew the particulars now!⁠—and he intended to leave the mixture a week and then allow it to cool slowly. Unless he had miscalculated, the last stage in the combination would occur when the stuff sank to a temperature of 60° F But it chanced that, unknown to Cavor, dissension had arisen about the furnace tending. Gibbs, who had previously seen to this, had suddenly attempted to shift it to the man who had been a gardener, on the score that coal was soil, being dug, and therefore could not possibly fall within the province of a joiner; the man who had been a jobbing gardener alleged, however, that coal was a metallic or ore-like substance, let alone that he was cook. But Spargus insisted on Gibbs doing the coaling, seeing that he was a joiner and that coal is notoriously fossil wood. Consequently Gibbs ceased to replenish the furnace, and no one else did so, and Cavor was too much immersed in certain interesting problems concerning a Cavorite flying machine (neglecting the resistance of the air and one or two other points) to perceive that anything was wrong. And the premature birth of his invention took place just as he was coming across the field to my bungalow for our afternoon talk and tea.</p>
+			<p>Oddly enough, it was made at last by accident, when <abbr epub:type="z3998:name-title">Mr.</abbr> Cavor least expected it. He had fused together a number of metals and certain other things⁠—I wish I knew the particulars now!⁠—and he intended to leave the mixture a week and then allow it to cool slowly. Unless he had miscalculated, the last stage in the combination would occur when the stuff sank to a temperature of 60° <abbr epub:type="se:temperature">F</abbr> But it chanced that, unknown to Cavor, dissension had arisen about the furnace tending. Gibbs, who had previously seen to this, had suddenly attempted to shift it to the man who had been a gardener, on the score that coal was soil, being dug, and therefore could not possibly fall within the province of a joiner; the man who had been a jobbing gardener alleged, however, that coal was a metallic or ore-like substance, let alone that he was cook. But Spargus insisted on Gibbs doing the coaling, seeing that he was a joiner and that coal is notoriously fossil wood. Consequently Gibbs ceased to replenish the furnace, and no one else did so, and Cavor was too much immersed in certain interesting problems concerning a Cavorite flying machine (neglecting the resistance of the air and one or two other points) to perceive that anything was wrong. And the premature birth of his invention took place just as he was coming across the field to my bungalow for our afternoon talk and tea.</p>
 			<p>I remember the occasion with extreme vividness. The water was boiling, and everything was prepared, and the sound of his “zuzzoo” had brought me out upon the verandah. His active little figure was black against the autumnal sunset, and to the right the chimneys of his house just rose above a gloriously tinted group of trees. Remoter rose the Wealden Hills, faint and blue, while to the left the hazy marsh spread out spacious and serene. And then⁠—!</p>
 			<p>The chimneys jerked heavenward, smashing into a string of bricks as they rose, and the roof and a miscellany of furniture followed. Then overtaking them came a huge white flame. The trees about the building swayed and whirled and tore themselves to pieces, that sprang towards the flare. My ears were smitten with a clap of thunder that left me deaf on one side for life, and all about me windows smashed, unheeded.</p>
 			<p>I took three steps from the verandah towards Cavor’s house, and even as I did so came the wind.</p>
@@ -37,7 +37,7 @@
 			<p>“It was <em>not</em> an explosion. It’s perfectly simple. Only, as I say, I’m apt to overlook these little things. It’s that zuzzoo business on a larger scale. Inadvertently I made this substance of mine, this Cavorite, in a thin, wide sheet.⁠ ⁠…”</p>
 			<p>He paused. “You are quite clear that the stuff is opaque to gravitation, that it cuts off things from gravitating towards each other?”</p>
 			<p>“Yes,” said I. “Yes.”</p>
-			<p>“Well, so soon as it reached a temperature of 60° F and the process of its manufacture was complete, the air above it, the portions of roof and ceiling and floor above it ceased to have weight. I suppose you know⁠—everybody knows nowadays⁠—that, as a usual thing, the air <em>has</em> weight, that it presses on everything at the surface of the earth, presses in all directions, with a pressure of fourteen and a half pounds to the square inch?”</p>
+			<p>“Well, so soon as it reached a temperature of 60° <abbr epub:type="se:temperature">F</abbr> and the process of its manufacture was complete, the air above it, the portions of roof and ceiling and floor above it ceased to have weight. I suppose you know⁠—everybody knows nowadays⁠—that, as a usual thing, the air <em>has</em> weight, that it presses on everything at the surface of the earth, presses in all directions, with a pressure of fourteen and a half pounds to the square inch?”</p>
 			<p>“I know that,” said I. “Go on.”</p>
 			<p>“I know that too,” he remarked. “Only this shows you how useless knowledge is unless you apply it. You see, over our Cavorite this ceased to be the case, the air there ceased to exert any pressure, and the air round it and not over the Cavorite was exerting a pressure of fourteen pounds and a half to the square inch upon this suddenly weightless air. Ah! you begin to see! The air all about the Cavorite crushed in upon the air above it with irresistible force. The air above the Cavorite was forced upward violently, the air that rushed in to replace it immediately lost weight, ceased to exert any pressure, followed suit, blew the ceiling through and the roof off.⁠ ⁠…</p>
 			<p>“You perceive,” he said, “it formed a sort of atmospheric fountain, a kind of chimney in the atmosphere. And if the Cavorite itself hadn’t been loose and so got sucked up the chimney, does it occur to you what would have happened?”</p>