Scientific American Supplement, No. 303, October 22, 1881
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Thecorrection accordingly is made as follows: the vacuum is first measuredas described above, then by withdrawing all the boxes except the lowest, the mercury is allowed to fall so as nearly to empty the gauge; it isthen made again to fill the gauge, and these operations are repeateduntil they amount in all to six; finally the volume and pressure are asecond time measured. Assuming the pressure to remain constant, or thatthe volumes are reduced to the same pressure, v = the original volume; v' ...= the final volume; V' = volume of air introduced by the first entry of the mercury; V = corrected volume; then V' = (v'-v)/6 V = v - [(v'-v)/6] It will be noticed that it is assumed in this formula that the sameamount of air is introduced into the gauge in the acts of entry andexit; in the act of entering in point of fact more fresh mercury isexposed to the action of the vacuum than in the act exit, which mightpossibly make the true gauge-correction rather larger than that given bythe formula. It has been found that when the pump is in constant use thegauge-correction gradually diminishes from day to day; in other words, the air is gradually pumped out of the gauge-mercury.
What to read after Scientific American Supplement, No. 303, October 22, 1881?
You can find similar books in the "Read Also" column, or choose other free books by Various to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Thecorrection accordingly is made as follows: the vacuum is first measuredas described above, then by withdrawing all the boxes except the lowest, the mercury is allowed to fall so as nearly to empty the gauge; it isthen made again to fill the gauge, and these operations are repeateduntil they amount in all to six; finally the volume and pressure are asecond time measured. Assuming the pressure to remain constant, or thatthe volumes are reduced to the same pressure, v = the original volume; v' ...= the final volume; V' = volume of air introduced by the first entry of the mercury; V = corrected volume; then V' = (v'-v)/6 V = v - [(v'-v)/6] It will be noticed that it is assumed in this formula that the sameamount of air is introduced into the gauge in the acts of entry andexit; in the act of entering in point of fact more fresh mercury isexposed to the action of the vacuum than in the act exit, which mightpossibly make the true gauge-correction rather larger than that given bythe formula. It has been found that when the pump is in constant use thegauge-correction gradually diminishes from day to day; in other words, the air is gradually pumped out of the gauge-mercury.
What to read after Scientific American Supplement, No. 303, October 22, 1881?
You can find similar books in the "Read Also" column, or choose other free books by Various to read onlineMoreLess
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