Communications from the Kamerlingh Onnes Laboratory of the University of Leiden Volume 6, Nos. 61-73

Communications from the Kamerlingh Onnes Laboratory of the University of Leiden Volume 6, Nos. 61-73

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 edition. Excerpt: ...a long tube reaching from the stopper to the bottom could not be used, as round the steel flanged tube cemented on the glass tube only half a centimeter space was left. (In order to prevent during the experiments the leakage of mercury, the hard red cement of Mendelejeff at the lower end was replaced by soft black cement, which moreover was covered at the inside with an india rubber solution). In order to ascertain that this connecting tube did not interfere with the attainment of equilibrium of pressure, the measurement for the determination of the normal volume of one of the piezometer tubes was made in four ways: 1st with the connecting tube; 2nd the connecting tube being disconnected from the waterbath; 3rd the connecting tube being disconnected from the barometer; 4th without the connecting tube. These four kinds of observations agreed to 1 within mu-. while I simultaneously made a measurement of the difference in level of the mercury in the U-tube of the piezometer. It is this latter determination which most renders uncertain the measurement of pressure. For, the diameter of the U-tube is only about 8 m.m., so that with the greatest height of the meniscus which occurs viz. 1.66 m.m. the depression becomes 0.69 m.m. l) and a difference in diameter of 0.1 m.m. gives here already a difference of 0.03 m.m., while a difference in height of 0.1 m.m. gives a difference in depression of 0.06 m.m. If moreover we take into account that the height of the mercury in the limbs of the U-tube is read through a water-layer of 6 c.m. thickness, it is obvious that in the measurement mentioned an error may enter, which greatly diminishes the accuracy of the measurement of pressure otherwise to be expected in the normal volume; this may more

Product details

  • Paperback
  • 189 x 246 x 4mm | 163g
  • United States
  • English
  • black & white illustrations
  • 1236992695
  • 9781236992697