Shinku
Online ISSN : 1880-9413
Print ISSN : 0559-8516
ISSN-L : 0559-8516
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Volume 4, Issue 9
Displaying 1-4 of 4 articles from this issue
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  • Crystalline Material formed from Glass “Fotoceram and Pyroceram”
    Shoji HASHI
    1961 Volume 4 Issue 9 Pages 359-366
    Published: September 20, 1961
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.4.359
    JOURNAL FREE ACCESS
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  • Water-ring Pump
    Shuiti TAKADA, [in Japanese]
    1961 Volume 4 Issue 9 Pages 367-370
    Published: September 20, 1961
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.4.367
    JOURNAL FREE ACCESS
    Download PDF (454K)
  • Theoretical Considerations and Designing
    Design and Construction of Vacuum Microbalance of Gulbransen type (I)
    Hajime ISHIMURA
    1961 Volume 4 Issue 9 Pages 371-379
    Published: September 20, 1961
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.4.371
    JOURNAL FREE ACCESS
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    A highly sensitive microbalance of Gulbransen type having the beam made of fused silica and supported on a fine tungsten wire, has been designed and constructed for the use in high vacuum. The present paper deals with the theoretical considerations on sensitivity as affected by the geometry and weights, of the parts constituting the balance, the bending of the beam, and the dimensions of the supporting wire.
    Precision, capacity, and range are also discussed. If it be carefully constructed according to the design, sensitivity of about 10-3g/rad. can be attained. Higher sensitivity is delimited by uncontrollable errors of construction. But some slight corrections can considerably raise the sensitivity of the finished balance. Design considerations and preparation of the materials required are given. Detailed procedures of construction will be described later.
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  • Effect of Physical Adsorption of Water Vapour on Evacuation Process of Vacuum Apparatus
    Yutaka TUZI
    1961 Volume 4 Issue 9 Pages 380-384
    Published: September 20, 1961
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.4.380
    JOURNAL FREE ACCESS
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    The effect of physical adsorption of water vapour on production of high vacuum was discussed.
    As the life time of water vapour adsorbed on lead borosilicate glass at 10-6 Torr, 050°C is about 510 ×10-4 sec, the adsorption very rapidly reaches an equilibrium condition. Henry's law is held in pressure region of 10-6 Torr where Henry's constant (k) at 0°C and 25°C are 1520 and 47 respectively. Effective volume of the apparatus increases to V+kA by the physical adsorption, where V and A are volume and real surface area of inner wall of the apparatus.
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