'It is any wonder White Oak is said to be the best prepared domestic coal marketed from W. VA., when you look at this picture of White egg coal taken as it is being loaded inot a a railroad car? Perfectly sized; perfectly screened and quality unsurpassed. No wonder it is the most popular sized coal sold in the domestic market.'
'The size and design of the shaker screens now in use at the White Oak mines are the best that an experience of twenty years in preparing Smokeless Coal has found to be the best and yield a satisfactory screened and sized coal. A screen must first be of ample size to take care of the amount of tonnage passing over it, because of crowding and overloading a screen results in poorly screened and poorly sized coal. The screen shown in this picture is handling 400 tons per hour and still has ample screening space to spare. The flow of coal over these White Oak shaker screens is controlled by a feeder which cannot be become stopped up by coal sticking in the slots because the slots are wider at the base than at the top and are therefore self clearing. The lips keep the coal turning over and over so it is impossible for slack to ride over on the larger pieces. The coal never falls; it is always sliding while being screened which helps prevent breakage. Note the uniform size and firm character of the lump coal which has passed over the egg screen shown in this picture.'
