94 
DR. ANDREWS ON THE HEAT DISENGAGED 
equivalent 40’5 grms. water. The apparatus in contact with the fluids contained 
92 grins, copper, 20 grms. brass, and 43 grms. glass, besides the cork, &c. Its ther- 
mal equivalent, the excess of zinc included, was 17'4 grms. water. The degrees are 
those of the centigrade scale. 
I. Air 1 3°’4. Increment found 2°‘54, corrected 2°‘53. 
Water 242’6 grms. Solution and vessels (equivalent to) 57‘9 grms. 
II. Air 11°'8. Increment found 2°'53, corrected 2°'53. 
Water 243‘5 grms. Solution and vessels 57’9 grms. 
III. Air 12°'0. Increment found 2°'51, corrected 2°'52. 
Water 243'5 grms. Solution and vessels 57’9 grms. 
IV. Air ]5°'4. Increment found 2°’51, corrected 2“'50. 
Water 243'6 grms. Solution and vessels 57*9 grms. 
Hence we have for the heat of combination referred to 1 grm. of metallic copper 
as unit, 
I. II. III. IV. Mean. 
866° 868° 865° 858° 864°. 
Chloride of Copper and Zinc.- — The solution of chloride of copper weighed 43*3 grms. 
and contained TlOO grm. oxide of copper. The specific heat of the solution of 
chloride of zinc was found to be 0'946. 
I. Air 13°‘5. Increment found 2° 50, corrected 2°‘51. 
Water 243*3 grms. Solution and vessels (equivalent to) 58*3 grms. 
II. Air 14°*0. Increment found 2°‘52, corrected 2°*52. 
Water 238*3 grms. Solution and vessels 58*3 grms. 
III. Air 14°*9. Increment found 2°*49, corrected 2°*50. 
Water 244*8 grms. Solution and vessels 58*3 grms. 
IV. Air 13°*6. Increment found 2°'49, corrected 2°*50. 
Water 241*1 grms. Solution and vessels 58*3 grms. 
We have, therefore, for the heat of combination referred to the same unit as before, 
I. II. III. IV. Mean. 
862° 851° 863° 852° 857°. 
Acetate of Copper and Zinc. — The solution of acetate of copper weighed 43*3 grms. 
and contained 1*092 grm. oxide of copper. The solution of acetate of zinc formed 
during the reaction had a specific heat of 0*930. 
I. Air 16°*7- Increment found 2°*43, corrected 2°*44. 
Water 242*8 grms. Solution and vessels (equivalent to) 57'6 grms 
II. Air 16°*7. Increment found 2°*43, corrected 2°*44. 
Water 243*6 grms. Solution and vessels 57’6 grms. 
III. Air 15°*5. Increment found 2°*40, corrected 2°*41. 
Water 242*8 grms. Solution and vessels 57’6 grms. 
I. II. III. 
841° 843° 830° 
Mean. 
838°. 
