ON THE KEW OBSERVATORY. 



137 



The insulator c, with its table, &c. removed into the north room, without 

 any fire in the stove. 



It appears from these observations that very little difference arises in the 

 insulating powers of our warmed glass pillars, from the circumstance of their 

 being placed in an atmosphere a little more or less humid and cold. 



4. Comparison of two united with two single Insulators. 



In the united state of the insulators a and b, in these experiments every- 

 thing was disposed as in experiment 1. 



In their single state the uniting wire was withdrawn in the manner stated 

 in experiment 2. 



