Show puta coal much inch of our english coal is ia of a some what low quality not only does it con tarn tain slate plate ard other athy impurities impure ties but also tely pyrites more than one half of which consists consist of sulphur our coal fields are being bein worked out with a velocity velocity which produces anxiety in the minds of all who are inter ested about the future of the country we cannot afford to waste even he poorest kind of fuel and the propriety of restricting exportation has repeatedly been urged with powerful arguments but bat in the meantime the burning of impure im and dirty coal is a source of tribulation t to housekeepers find and of injury to manufacturers A process of mr ludrigs Luh rigs appears to be an improvement upon various previous attempts renders it possible for colliery owners to clean and to some extent purify without great expense the coal before befaro it is sent away the system involves involve 3 a series of operations in which are included dry separation breaking sizing washing recovery of sludge automatic transportation etc it is said that the method is all already ea a y III in 1 successful operation in many places and from a sanitary no less than from an economic point it of view every ono one must hupe hope for its success london lancet |