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A gas thermometer with constant bulb temperature has been devised to renew determination of Kelvin temperature of the gold point. For the thermometer gas to be of a definite volume, the gas is isolated from the manometer mercury seal in a capillary U-tube with which device the gas pressure is obtained indirectly applying due correction to the pressure read on the manometer when the isolation is deleted lowering the sealing mercury to the bottom of the capillary U-tube. Description of the apparatus and measuring principle are given. This method of determining the gas pressure is applicable to gas thermometer of any other type.
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Jirô Oishi (1961) studied this question.
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