Hydraulic coal bursters

Cardox is a device for breaking coal in gaseous mines by the pressure produced on heating liquefied carbon dioxide. It is briefly described in Vol 2 of Encycl, p C67-R. Similar devices, Airdox and Armstrong Air Breaker, were developed in. 1930 in the US. More successful were Hydrox developed in 1955 and Chemecol developed by du Pont Co before 1958. They are also Hydraulic Coal Bursters (See Vol 3 of Encycl, p C434)... 

Hydraulic Coal Bursters are devices Using compressed water for breaking down the coal. Some of these devices are described in the book of J. Taylor and P.F. Gay, British Coal Mining Explosives , G. Newnes Ltd, London (1958), pp 134-137... 

General requirements and tests for blasting devices used in USA are given in Ref 2 In conclusion it may be mentioned that several devices utilizing water under high pressure have been developed. They are known as Hydraulic Coal Bursters. For their description, see Ref 5,pp 134-37 Refs DBlasters Hdbk(1952),79-82 2)Bureau of Mines Schedule 26A, "Blasting Devices , Federal Register, March 22,1955,... 

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