PROFESSOR THOMSON ON THE ELECTRO-DYNAMIC QUALITIES OF METALS. 679 
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[Tables belonging- to § 56.] 
Table I. October 28th, 1853. Conductor composed of thirteen slips of sheet copper. 
Middle of conductor in water kept boiling. 
Streams of water at temperature 6° running through the coolers. 
Temperatures at middle points A, B of the parts between heater and coolers : — Initial Ta=55°-20, Tb=52°-94 ; 
