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An Improved Method for Determining Bomb Calorimeter Values

Macdonald College¹

Abstract

THE method presented herein utilizes a peroxide bomb calorimeter and a recording potentiometer equipped with a maganin-nickel thermocouple. The advantages afforded by the recording potentiometer are, first, the temperature change is easily determined and second, a permanent record of the determinations is made.

The bomb is ignited with an electric ignition unit and is rotated by an electric motor driving through an elastic band (figure 1).

The recording potentiometer used in this laboratory is a Brown Electronic Strip Chart Recorder and Indicating Potentiometer. The scale is graduated from 18° C. to 28° C. and readings can be estimated with good accuracy to the nearest hundredth of a degree. The 6'' steel resistance thermometer is connected to the potentiometer with a 36'' conductor cable, both of which are supplied by the instrument manufacturers. Our recorder operates at a speed of 10 inches per hour and is equipped with an operational pen.

¹ Contribution from the Faculty of Agriculture, McGill University, MacDonald College, Que., Canada. Journal Series No. 336.