| Show 0 PRACTICAL SHAFT SINKING practical sinking is the title of a new work by francis donaldson M E chief engineer for the dravo contracting company this is a most valuable and timely publication and contains new ideas and important suggestions pertaining to the subject matter the book contains pages is profusely illustrated contains ten chapters and treats on some deep shafts plant required sinking through surface sinking through soft ground sinking in rock the sinking drum process the kind chaudron boring process lifting water shafting lining and concrete lining cloth bound 2 postpaid sent to any address upon receipt of price by the mining review distributors box 1137 salt lake city utah |
