TRANSACTIONS OF SECTION G. 



781 



Professor Ordway's (Massacliusetts Inst. Teclinology) method — with modifica- 

 tions by the author of this paper — was applied to obtain the foregoing results. A 

 mass of each non-conducting material, one inch thick, was used for each experi- 

 ment. This mass was carefully prepared and placed on a perfectly true, flat, iron 

 plate or tray, which was then carefully maintained at a constant temp, of 310° F. 

 The heat transmitted through each non-conducting mass was calculated in pounds 

 of water heated 10° F. per hour. Table II. gives the results of practically treating 

 the several non-conducting mixtures on a 5-inch steam pipe, which was subject to 

 much vibration. 



7. A joint Discussion with Section A. vpon Units and their Nomenclature 

 took -place. See p. 577. 



