(1) 油エジエクタポンプ用油の作動条件に合う熱分解量測定装置を作った。
(2) D.B.P., 鉱油, 及びアルキルナフタレンについて先ず実験を行い, 分解生成ガスの発生速度, 活性化エネルギ, 油量との関係, 金属に対する影響及びドライアイスの温匿でトラップされるガスの割合を調べた。
(3) その結果, いずれも油量に比例する均一な一次反応で, 金属に対する影響は認められないことがわかった。
(4) 初期における発生速度の変化の様子, 定常期における活性化エネルギの値は拡散ポンプ油の熟分解の場合とよく一致した。
(5) これら3種の油のうちでは炭化水素系 (鉱油, アルキルナフタレン) が熱分解の点でD.B.P.よりすぐれていることがわかった。

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Influences of the various pumping fluids on the operating performance of 8″ ejector booster type vacuum pump are examined.
The fluids used are diethylphthalate, dibutylphthalate and hydrocarbon oil (mean molecular weight=250). Another combined factors, i. e. diameter of throttle, heat input, foreside pressure are also changed together.
The authors have gotten some effective informations with these three pumping fluids about the relations between evacuating speed and heat input, boiler pressure and heat input, boiler temperature and heat input respectively.

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The discharge characteristics of cold cathode ionization gauges having a central wire electrode, were compared with those of the ordinary types of Philips gauge. As is stated ordinarily, two types of these gauges behaved similarly in the lower vacuum region.
At the high vacuum, however, it has been observed that the discharge characteristics of the former type are different from the latter. The stability of the gauge was somewhat improved by using the central wire electrode.

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The kinetics of the initial fast adsorption of carbon monoxide and hydrogen on evaporated nickel films has been investigated by a flow method. The ultimate vacuum obtained is 1×10^-9 mmHg and the surface of the film can be kept clean during and after evaporation. There are two distinct differences in the rate of chemisorption between carbon monoxide and hydrogen. The sticking probability of carbon monoxide is estimated to be nearly 1 at 0°C on clean surface and remains constant until the surface is covered to some extent. With hydrogen, however, it is about 0.1 at the same condition, and begins to decrease at a lower coverage.
Applying the potential energy diagram proposed by Lennard-Jones to the above systems, the difference in the initial value of sticking probability is explained as due to the difference in type of chemisorption, i.e., carbon monoxide chemisorbs without dissociation, whereas hydrogen does with dissociation. The difference in the decrease of sticking probability with adsorption is considered to be due to the difference in mobility of adsorbate on the surface ; at room temperature surface migration is easy for hydrogen, but not for carbon monoxide. The chemisorption model proposed here can be extended to the slow adsorption of carbon monoxide previously reported.

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Evacuating speed of a rotary vacuum pump decreases as pressure decrease, but mathematical expression showing this tendency is unknown. Only the equation dP/dt=-So/V (P-P_min) is introduced by experiences, but the physical meaning of P_min (final pressure) is very chaotic.
The author explains this meaning by simple calculation, as P_min is the parameter containing dead space volume, outgassing and leakage.
But unfortunately, as the above equation is not always appropriate for the actual pumps, the author proposes more adequate expression S = {1- (P_min/P)^a} So.

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