I02 



REPORTS ON INVESTIGATIONS AND PROJECTS. 



Point. 



Benzophenone (Kahlbaum), boiling- 

 point at 760 mm. 



Cadmium, melting-point 



Zinc, meltinET-point 



Sulphur, boil ins- point at 760 mm.... 

 Antimony (Kahlbaum). melting-point 

 Aluminum, melting-point 



Notes. 



Transferred by platin-rhodium and 

 copper constantan thermo-cle- 

 ments. 



Interpolated. 



Transferred by ther mo-elements. 



Direct. 



Transferred by thermo-elements. 



Interpolated. 



(7) Die Stickstoffthermometerskala von 300-630° und eine direkte Bestimmung des 

 Siedepunktes des Schwefels. Arthur L. Day und Robert B. Sosman. Ann. 

 Physik, 38, 849-869. 19 1 2. 



A German translation of " The nitrogen thermometer scale from 300° to 

 630°^ with a direct determination of the boiling-point of sulphur" (Am. 

 Jour. Sci. (4), 33, 517-533, 1912). Reviewed under No. 6 above. 



(8) A note on the standard scale of temperatures between 200° and 1100°. L. H. 



Adams and J. Johnston. J. Wash. Acad. Sci., 2, 275-284. 1912. 



A preliminary publication of the results described in paper No. 9: 



(9) A note on the standard scale of temperatures between 200° and 1100°. L. H. 



Adams and J. Johnston. Am. Jour. Sci. (4), 33, 534-545- 1912. 



In this note is given a new calibration curve for copper-constantan thermo- 

 elements, extending from 0° up to 360°, together with a series of inde- 

 pendent measurements of the temperature differences between the boiling- 

 points of naphthalene (217.95°) and benzophenone (305.9°) on the one hand 

 and the freezing-points of tin, bismuth, cadmium, and lead on the other. 

 These measurements lead to the following values of the freezing-points : 

 Sn, 231.8° ; Bi, 271.0° ; Cd, 320.9° ; Pb, 327.3°. The concordance of these 

 values with those obtained by other measurements show that the thermo- 

 element is not inferior to the resistance thermometer within this range of 

 temperature (0° to 360°). Moreover, a comparison of the gas-thermome- 

 ter determinations with the results obtained by means of those interpolation 

 instruments (thermo-element, resistance thermometer, etc.) which measure 

 not temperature independently but a well-defined physical property which 

 changes continuously with the temperature, affords an excellent opportunity, 

 through this continuity, for the discovery of inconsistencies in the gas-ther- 

 mometer measurements. The remarkable concordance of the present series 

 of thermo-electric measurements and of the most extensive recent series of 

 resistance-thermometer measurements (Bureau of Standards), with the re- 

 cent gas-thermometer determinations made in this laboratory, serves, there- 

 fore, as an efficient and independent check upon the trustworthiness of the 

 present gas-thermometer scale between 0° "and 1100°. 



(10) On the density of solid substances, with especial reference to permanent changes 



produced by high pressures. John Johnston and L,. H. Adams. J. Am. 

 Chem. Soc, 34, 563-584. 1912. 



With a new and improved form of pyknometer the density of salts and 

 other substances has been determined with an accuracy of 3 or 4 units in the 

 fourth decimal place, that is, within 0.02 per cent. In many cases, however, 



