EDITOR'S C O L U M N
3. Incorporate a platinum resist ance thermometer scale in the re gion between the hydrogen and oxygen points. 4. Eliminate the sulfur (444.6° C.) and replace it with the zinc point (at present 419.505° C , but, see proposal 5). 5. Change the values of the zinc (419.505° C ) , silver (960.8° C ) , and the gold (1063° C.) points on the IPTS by about +0.07, + 1 . 1 , and +1.5 degrees, respectively. 6. Replace the standard thermo couple on the scale with the plat inum resistance thermometer (prt). The U. S. National Bureau of Standards has contributed to the foundations of the IPTS, and is currently working on two major projects. One concerns the develop ment of an ultrasonic thermometer as an absolute device in the region between 5° K. and the hydrogen point, and the other is concerned with gas thermometry.
For preparation of
ULTRA PURE GASES for laboratory use
f
THE NEW GILBARCO HEATLESS FRACTIONATOR .
