Chambers's encyclopaedia; a dictionary of universal knowledge for the people . ed for barom-eters, must be shaken well with highly dilute but pure nitricacid, to remove extraneous metals and oxides. The same objectis effected more thoroughly by keeping it several weeks in contactwith the dilute acid, stirring every now and then. After eitherprocess, the metal must be thoroughly washed witli distilledwater, and dried. In filling the tube, it is essentiallj- necessary toget the column free from aii- and moisture. To effect this, the P. ilSs Figs. 1, Lu ji -:;.FAia. 0, 7. tained by boiling the me
Chambers's encyclopaedia; a dictionary of universal knowledge for the people . ed for barom-eters, must be shaken well with highly dilute but pure nitricacid, to remove extraneous metals and oxides. The same objectis effected more thoroughly by keeping it several weeks in contactwith the dilute acid, stirring every now and then. After eitherprocess, the metal must be thoroughly washed witli distilledwater, and dried. In filling the tube, it is essentiallj- necessary toget the column free from aii- and moisture. To effect this, the P. ilSs Figs. 1, Lu ji -:;.FAia. 0, 7. tained by boiling the mercury, in the first instance, in an atmos-phere of carbonic acid, and then ])ouring it into the previouslylieateil tube by a^ller reaching to the bottom of it. Such care isonly expended on the best instruments: ordinary weather-glasses,not needing to be quite accurate, are more simply filled. Not-withstanding all these precautions, minute, bubbles of air manage
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