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April, ~939.] NATIONAL BUREAU OF STANDARDS NOTES. 549 rhodium) with a gas thermometer. In the future, thermometers submitted for calibration will be compared with these calibrated resistance thermometers. At present the newly established scale is maintained by the seven resistance thermometers. However, it is intended that the scale shall be based upon fixed points, that is, boiling, triple, and transition points of pure substances, and determinations are now being made of the temperatures of fixed points on the newly established scale. The temperatures found for the boiling and triple points of normal hydrogen on this scale are I3.960 and 20.39 Β° K. (--259.20 Β° and -252.77 Β° C.) respectively.
EFFECT OF THE SOLUBILITY OF GLASS ON THE BEHAVIOR OF THE GLASS ELECTRODE.
π SIMILAR VOLUMES
## Abstract The purpose of this study was to evaluate the effect of sodium content on the crystallization behavior of glassβceramics in the system SiO~2~βMgOβCaOβNa~2~OβK~2~OβF. Five glass compositions were prepared with increasing sodium content. The compositions were melted at 1400 Β°C for 2 h and
Since the discovery of H Γ· selective glass electrodes in the late thirties and the advent of glass electrodes selective for other univalent cations in the fifties, the problem of the operative mechanism of glass electrodes has been the subject of a number of opinions and studies 1-12. Current ideas
This surface resistance has been measured normal to the electrode surface. The resistance has been found to be located some distance within the physical surface and the name surface should therefore not be interpreted too literally.