OF THE NATIONAL PHYSICAL LABORATORY. 



865 



XX. Series II. 

 ICE-POINT; 3. April 16, 1903. 



Observer, J. A. H. 



It will be observed that during the 10 minutes covered by the observations the 

 barometric pressure fell rather more than O'l millim. while the scale reading rose a 

 corresponding amount. 



* On this occasion the variations in the temperature of the jacket water were so abnormally great 

 during the preliminary period before the experiment, that it was decided to dispense with the circulation 

 in the space round the platinum capillary and take the whole dead space as being at the temperature of 

 the part below the stopper in che closed limb of the manometer, given by thermometer No. 1. 



