456 Proceedings of Royal Society of Edinburgh. [skss. 
proximate weight having been already placed in the pan, the agate 
is raised and the calorimeter swings free of the mercury cups. 
The weight is then noted to the nearest ^ centigm. The agate 
is then lowered, a 50-gm. weight removed from the pan, and the 
1 
» i 
right-hand hook sinks into the rest and the electrodes into the 
mercury cups. The current has been meanwhile flowing in an 
alternative circuit of equal resistance, indicated in the diagram as 
connected to the two-way switch. 
