The authors describe the performances of the new type ionization gauges UVG-1 and UVG-2 having grids of U-form and conclude that.
1) The mounting of the electroctes of these gauges are very easy, and the deviations of their sensitivities from each other are very small.
2) The grids anre of the U-form, and two leads are provided in order that grids may be heated electrically.
3) The sensitivities of UVG-1 and UVG-2 are large, the former sensitivity K being 40/mmHg, and the later one about 90/mmHg.

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Characteristics of a new type of high vacuum pump, called evapor-ion pump which was reported recently by Herb and his co-workers, was studied.The end-vacuum of the pump which was constructed by glass, was 0.62×10^-6mmHg and the rate of the consumption of titanium was 1020mg/hr.for the pumping speeds of the order of 1l/s.By the ionyation of the gas the pumping speed for air was increased by several times.

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An oil ejector booster which can operate in high suction pressure range (0.11mmHg) and against high forepressure (10mmHg) is obtained.
The nature of operation, pumping mechanism and operation cost is discussed.

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The Anthor criticises the merits and the defects of double tube (differential) or mono tube method of leak detection using hot filament ionization gauge.
In case of using Acetone or ether as probe material, the mono tube method has comparable sensitivity as that of differential method, though the “Image effect” named by the author, sometimes gives various modes of wave form of the detected out put current.

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An experiment which shows the permeability of helium in Various rubber including silicon products is described, G.E.type helium detector was used for detecting helium.

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