98 Rev. C. Trotter. Physical Properties of Ice [Jan. 29, 



Fig. 1. 



whole could be hung up was screwed into CD. This is drawn for 

 distinctness sake in the plane of the hoard. It was actually in a plane 

 at right angles to that of the board (see fig. 2). 



Two of these blocks were suspended from a cross-piece (see fig. 2). 



Fig. 2. 



The distance of the hooks on the cross-piece was so adjusted that 

 there was just room between the two hanging-blocks for the third 

 block to move freely up and down. A square bar of ice, ab, was then 



