Show coal savers savera various preparations are extensively advertised in this country at present which are presumed to contribute cori considerably sider ably to the heating power of coal when applied in the prescribed dos doses es writes consul general stobert P skinner london the director of fuel re search in answer to an inquiry as to the value of these preparations states that these proprietary substances havo have been in the market a long time but that there does not appear to be adyr genuine scientific evidence in support of the claims of their manufacturers he concludes the nature of the substances makes it highly improbable that they have any effect whatsoever on the combustion of coal or other fuels when they are used in the quart quan 4 titles prescribed |