. Carnegie Institution of Washington publication. POTASSIUM, RUBIDIUM, AND C-TISIUM. The two hydraulic gauges used for the registration of the pressure were made at different times by Schaeffer & Budenberg, of Zurich, Switzer- land. One of these gauges, that used in the previous work, was labeled No. 2740747, while the other, procured a year later, was labeled No. 3014491. As will be shown, the two gauges agreed very well with one another as far as 500 atmospheres, and also agreed in general with those of the Brooklyn establishment of the same firm, each gauge having been sent to Brooklyn
. Carnegie Institution of Washington publication. POTASSIUM, RUBIDIUM, AND C-TISIUM. The two hydraulic gauges used for the registration of the pressure were made at different times by Schaeffer & Budenberg, of Zurich, Switzer- land. One of these gauges, that used in the previous work, was labeled No. 2740747, while the other, procured a year later, was labeled No. 3014491. As will be shown, the two gauges agreed very well with one another as far as 500 atmospheres, and also agreed in general with those of the Brooklyn establishment of the same firm, each gauge having been sent to Brooklyn for verification at different times. Because the agreement of our own gauges with one another was better than the agreements of the reports received from the Brooklyn firm, and because also the mean reading of our gauges gave a nearly linear curve for the compressibility of hardly com- pressible solids with increasing pressure, while the Brooklyn result gave curves less regular, the average reading of our two gauges was taken as the standard, and every reading of each gauge was corrected to corre- spond to it. In order to compare the two gauges together, they were both attached to the same compression-pump on several occasions, and the pressure was increased step by step, sometimes 50 atmospheres* at a time, and some- times only 10 atmospheres at a time. The discrepancies between different comparisons at the same point never exceeded an atmosphere, and the aver- age was taken as representing the true relation of the gauges. The cor- responding corrections are given in the following table, a positive correc- tion signifying that the gauges in question gave too low a value for the pressure. The gauges could scarcely be read more closely than to within 1 atmosphere; accordingly, the corrections are not made more precise than to within half an atmosphere. Corrections to be applied to gauges. [All the figures given below are kilograms per square centimeter.] Corrections. Corrections
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