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Vacuum-thermocouple .—The construction of a vacuum-thermocouple of high sensitivity and quick action for measuring heat radiation is described. Isolation of Long Heat Waves .—A method is given for isolating radiation of great purity and having a mean wave-length of 96 μ. This radiation is...
Making use of results obtained in a previous paper giving the average radial repulsion exerted by a charge e on a charge e ′ when both charges are revolving in circular orbits at a great distance, the author obtains a formula for the force between atoms. He concludes, in reply to a criticism by...
A method of eliminating contact difference of potential in Compton's modification of the quadrant electrometer is suggested. The quadrants must not be built up. Solder, fillers or finishers must be omitted. If the needle is of aluminium the quadrants must be of aluminium, milled out of a single...
Non-existence of groups .—Certain observers have found evidence indicating that the large ions produced by spraying water constitute several distinct groups each having a definite mobility. Using an apparatus similar to theirs, the author fails to confirm this result but finds that the ions...
The crystal structure of sodium nitrate has been determined from a study of the Laue photographs obtained by passing X-rays through crystal sections. The method of interpretation is similar to that used by Nishikawa in studying spinel. The unit rhombohedron of sodium nitrate is a body-centered...
The specific heats, thermal conductivities, thermoelectric powers, and specific resistances have been determined for a series of iron-nickel alloys of exceptional purity and definitely known composition. The specific heat (25° to 100° C.) varies only slightly with change in composition, but...
Surface Action in Electrical Discharges from Points .—The lag phenomena shown by the discharges from some points indicate a special surface action. Various possible surface actions are discussed and attention is centered upon an adhering layer of gas molecules. Further evidence is sought in...
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