THE vapor pressure of a liquid at a specified temperature is the pressure under which the liquid is in equilibrium with a vapor. In the case of a pure substance or single

A flexible capillary lead was connected to the needle valve, F, above the valve seat, and led to a mercury manometer stationed on the wall of the dark room.A capillary brass nipple taking off from the lateral projection, 6, with a ball and socket joint, was connected to needle valve, H, above its seat with a screw fitting and metallic seat.Needle valve, H, below its valve seat, was connected to needle valve, I, below its valve seat, by a capillary brass nipple with screw fittings and metallic seats. A flexible capillary tube leading from a common mapifold used for charging oxygen and nitrogen, was connected to needle valve, I, below its valve seat with a ball and socket joint. The needle valve, I, was supplied with an opening above its valve seat, 7, for flushing the line before charging the bomb. Pressure Element-For recording time-pressure curves of the explosions a modified Midgley indicator was used. The pressure element, J, similar to that described by Midgley,7

ACCORDING to an earlier paper (2) the rate of rise of pressure and the auto-ignition temperature of the explosive mixture appeared to indicate the relative knocking tendencies of different fuels in internalcombustion engines. The effect of tetraethyl lead upon rate of rise of pressure was reported a month ago (S).Last year (12) an apparatus was described in which flame and pressure propagation

Fundamental equations applicable to the continuous and differential vaporization processes have been derived and checked by comparison with experimental data. The two different processes have been studied

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