Show JEFFREY FAN CATALOGUE the jeffrey manufacturing company columbus ohio has just issued a new and very complete catalogue on centrifugal fans for mine ventilation this publication is one of the most complete catalogues cataloguer catal on this subject that has so far been issued and we believe it will wili be helpful as it contains useful information for the mine man who is interested in this important subject of mine ventilation I 1 this catalogue is a very fine piece oi of work from the printers viewpoint and contains numerous illustrations showing jeffrey fans installed in various mines throughout the country this book also contains the latest birdseye view of the establishment of the jeffrey manufacturing company which is the largest plant designing and building complete mine equipments in the world the jeffrey fan catalogue also contains various photographic illustrations showing the shop methods of constructing the fans also the unique method of balancing the fan wheels and assembling all parts of the fan casings there are also contained an in this catalogue many views showing the applications of diff different erent types of fans at over afif fifty ty different mines the capacities and other important machinery data are also given with very every installation as well as complete tests with the reproductions of the actual indicator cards showing the high efficiency of the jeffrey fan there are also a number of pages with reproductions of drawings giving a comprehensive idea of the general arrangement of foundation work necessary for jeffrey fans other valuable and interesting features in this catalogue are the engineering data and formulas which are arranged in convenient form for te reference ference by mining engineers and operators who have ventilating problems under consideration the jeffrey manufacturing company will be bb very pleased to send this catalogue to any of our readers who request it 0 |