The boiling-point of sulphur on the thermodynamic scale

Abstract

The experiments described in this paper were carried out with the constant-pressure gas thermometer. The form of the apparatus has been already given in some detail in a previous paper,* the results of which were not regarded as final owing to the alteration in volume of the glass bulb. The latter was, therefore, changed for one of fused silica, and, of course, the compensation tubes were likewise of silica. It is unnecessary to repeat all the details given in the previous communication, any change will be mentioned here; it can be assumed that the mode of experiment has remained the same in all other particulars. To avoid continual references back to this paper, figs. 1 and 2 are here repeated. Figs. 1 represent the bulb and expansion vessel, while fig. 2 shows the two gauges (the mercury and oil gauges); it should be added that the oil-gauge tap has since been changed for the tap shown in fig. 5 of the present paper. The silica bulb and connecting tubes are drawn roughly to scale in fig. 3. Two silica bulbs have been used of practically the same volume; the one has the form shown in the figure; in the other, the bulb is connected immediately to the tube B, the capillary tube D being continued down to C.