§ Mr. DENMANasked the Secretary for Mines if he has any information available for the public as to the relative heating value of different types of coal and coke?
§ Lieut.-Colonel COLVILLEI have been asked to reply. In considering the heating value of the fuels mentioned it is necessary to have regard not only to the class of coal or coke, but also to the conditions under which these fuels are used. So far as these factors concern domestic heating, and I assume my hon. Friend has this more particularly in mind, they are dealt with in certain publications issued by the Department of Scientific and Industrial Research. My hon. Friend the Secretary for Mines is sending him a list of these publications.