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MESSRS. R. S. HUTTON AND J. E. PETAVEL ON ELECTRIC 



TABLE IV. (1). Details of one Typical Calcium Carbide Experiment (C. 61). 



The large furnace enclosure was used in the vertical position (see Plate 6, fig. 1). 



Iron liner filled as shown in fig. 11, A. 



Lower electrode ( - ve), bed of 2 kilogs. retort carbon. 



Upper electrode ( + ve), a 41-millim. carbon rod, 32 centims. long. 



Weight with holder, 1657 grammes. Loss of weight during run, less than 5 grammes. 



Charge : alxmt 8600 grammes of a mixture of selected Buxton lime and petroleum coke (100 CaO : 65 C). 

 Lime all passed through a 20-mesh sieve, petroleum coke 60-mesh. The vessel with its contents was 

 heated for some hours to a red heat before the experiment to ensure complete drying of material. 



Initial pressure, atmospheric. 



The gas capacity of the furnace when charged was found to be 1 1 6 litres per atmosphere. 



All the gaseous products of reaction were retained during the experiment and for 42 hours after 

 completion of same, with the exception of the small quantities required for gas analysis at intervals as 

 recorded below. 



The E.M.F. at the terminals of the generators was varied as required and was usually 5 to 10 volts 

 above that on the furnace. 



TABLE IV. (2). 



* At 30 minutes after stop the cover attained a maximum temperature of 65 C., falling in 



2 hours to 30. 



