420 Improved Calorimeter for the Method of Mixtures. 



Gold. — Nearly pure. In the form of a thin bar. 



M. t. 9. T. m. S. 



July 3 17-8292 °20 24°00 100°00 1-7456 -03066 



„ 3 „ -25 24-41 10000 1-7101 -03065 



„ 5 „ -35 2345 99-95 1-8153 -03074 



Mean '03068 



Zinc. — As supplied for chemical use, purity unknown. 

 In the form of a thin cast bar. 



M. t. 9. T. m. S. 



Mar. 15 20-3805 °20 23°40 999 6416 09547 



„ 15 „ -20 2350 1000 6386 09544 



„ 16 ,, -27 23-85 1002 6-3017 -09549 



Mean -09547 



Alloy. — Melting-point 70° 0. Bismuth 4 parts, Cadmium 

 1 part, Lead 2 parts, Tin 1 part. Metals used were 

 supplied for chemical use ; purity unknown. 



M. t. 9. T. m. S. 



Feb. 15 16-108 2-53 21°94 60 ? 66 1-1475 -03571 



„ 15 „ 3-12 21-76 60-42 11913 -03566 



„ 16 „ 1-60 21-66 59-67 1-0875 -03563 



„ 18 „ 2-51 21-93 59-45 11080 -03560 



„ 19 „ 2-93 21-08 60-26 1-2390 -03563 



Mean -03565 



This method may readily be extended over a considerable 

 range of calometric work. The electric heater permits the 

 heating of the body under investigation to any temperature 

 ordinarily desired. The body may be cooled by a suitable 

 freezing mixture, and the initial temperature of the cup main- 

 tained by the introduction of warm water of known tempera- 

 ture, thus extending the range of temperatures throughout 

 which an investigation may be carried. The specific heat of 

 a liquid may be determined by enclosing it in a suitable 

 vessel, the constants of which have previously been determined. 

 Some liquid other than water may be found preferable for 

 special work, and may readily be used in the cup and cooler. 

 Aniline, the use of which is advocated by Mr. E. H. Griffiths*, 

 has a smaller capacity for heat and a higher boiling-point 



* Philosophical Magazine, xxxix p. 47, 1895. 



