"Subject to the provisions of this Ordinance, there shall be paid by the Central Government compensation for explosion damage to property being (a) damage caused by fire to property insured whether wholly or partially at the time of the explosion against fire under a policy (other than a policy of marine insur ance) covering fire risk, or damage caused by blast without fire intervening to property insured whether wholly or partially at the time of the explosion under a pollcy (other than a policy of marine insurance) covering fire and explo sion risks, of an amount equal to the proved loss, or (b) damage caused by blast without fire intervening to property insured whether wholly or partially at the time of the explosion against fire under a policy (other than a policy of marine insurance) covering fire risk but not explosion risk, of an amount equal to 871/2 per centum of the proved loss, to the holder of the policy of insurance covering the damaged property, or if he is deceased, to his legal representatives.