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Tare it accurately; pour water into the flask until the weight of the latter counterbalances weights on the opposite pan which equal in grams the number of cubic centimeters of water which the flask is to contain. The mark may be etched upon the flask by hydrofluoric acid, or by the use of an etching ink now commonly sold on the market.
Bromine and its Compounds Iodine and its Compounds Chlorine and its compounds Cyanide of Potassium Hyposulphite of Soda Hyposulphite of Gold Nitric Acid Nitro-Muriatic Acid Hydrochloric Acid Hydrofluoric Acid Sulphuric Acid Accelerating Substances Liquid Sensitives Dry Sensitives, etc., etc.
Make a glass tube of such thickness that it will take hydrofluoric acid four hours and a half to eat its way through. Then fill it with acid and seal it up. You have a time-fuse which will act precisely in four hours and a half." "If it comes into contact with the necessary explosive," Hillyard added. "Exactly. Now attend to this! Our workmen in our munition factories work three hours and a half.
He ticked them off upon his fingers. "First, hydrofluoric acid when brought into contact with certain forms of explosive will create a fire. Second, hydrofluoric acid will bite its way through glass. The thicker the glass, the longer the time required to set the acid free. Do you follow?" "Yes," said Hillyard. "Good!
The science in each course in those days could have been acquired just as well in a fortnight as in half a year. One muddled away three or four days etching a millimetre scale with hydrofluoric acid on glass to no earthly end that I could discover and a week or so in making a needless barometer.
It is well ascertained that springs, whether hot or cold, charged with carbonic acid, especially with hydrofluoric acid, which is often present in small quantities, are powerful causes of decomposition and chemical reaction in rocks through which they percolate.
The air was faintly yellow, the sky was yellow with a greenish cast, and the clouds were green-gray. No human had ever set foot on the surface, or breathed the air, of Niflheim. To have done so would have been instant death; the air was a mixture of free fluorine and fluoride gasses, the soil was metallic fluorides, damp with acid rains, and the river was pure hydrofluoric acid.
Some maintained that they were dissolved in vats of hydrofluoric acid. Others argued that they were encased in cement, then taken out to sea in speedboats on moonless nights and jettisoned. The favorite rumor was that the entire firm was a decoy to bewilder agents of foreign powers and pre-empt their espionage efforts. There was neither proof of this nor evidence to the contrary.
These tubes will be found very useful for collecting and concentrating into a small bulk the sediment contained in any liquid, whether it be composed of urinary deposits, diatoms in process of being cleaned, or any thing of like nature; and, as the parts are all of glass, the strongest acids may be used, excepting, of course, hydrofluoric acid, without harm to the tubes.
But the Latinist has a wide view, embracing modern times, the Middle Age and Antiquity; and his mental horizon is still further enlarged if he studies Greek or even Sanscrit. If a man knows no Latin, he belongs to the vulgar, even though he be a great virtuoso on the electrical machine and have the base of hydrofluoric acid in his crucible.
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