. Water & sewage works . , of the actual consumption as meas-ured in test plants. The Properties of Saturated and Su-perheated Ammonia ?\apor, by ProfessorG. A. Goodenough and Mr. W. E. Mosher,has been issued as BuUetin No. 66 of theEngineering Experiment Station of theUniversity of Illinois. It contains twotables of the properties of saturated an-monia and an extensive table of the prop-erties of superheated ammonia. The es-sential results are embodied in a conven-ient chart by means of which the usua>practical problems of refrigeration maybe solved graphically with a minimum oflabor and w
. Water & sewage works . , of the actual consumption as meas-ured in test plants. The Properties of Saturated and Su-perheated Ammonia ?\apor, by ProfessorG. A. Goodenough and Mr. W. E. Mosher,has been issued as BuUetin No. 66 of theEngineering Experiment Station of theUniversity of Illinois. It contains twotables of the properties of saturated an-monia and an extensive table of the prop-erties of superheated ammonia. The es-sential results are embodied in a conven-ient chart by means of which the usua>practical problems of refrigeration maybe solved graphically with a minimum oflabor and with a satisfactory degree ofaccuracy. Technical Schools The April bulletin of the University ofMichigan is devoted to the department ofengineering, and contains a general an- Civil Service Examinations The U. S. Civil Service Commission willhold examinations at the usual places asfollows: July 16, 17: Hull draftsman with ex-perience in dredge design in office ofChief of Engineers, U. S. Army, at $1,800a year. Jnhi 39IS. m MACHINERYAND SUPPLIES ¥\x^ A Roller and Scarifier Combined A score of years ago road buildingwas a very simple business, states F. , manager, Essex Trap Rock & Con-struction Co., Peabody, Mass. The roadcontractor tlien required but little equip-ment. During the last ten years, how-ever, methods of road building havechanged and contractors now face theproblem of choosing among multitud-inous types and makes of machines forevery imaginable purpose. Road building has become a businessinto which one should not enter withoutconsidering thoroly the kind and amountof equipment required to do the workthat he is contemplating, and only aftera careful estimate has been made of theexpense of plant and the proportionatecharges that should be made for thesame upon the work on which he is bid-ding. One must also realize that oncein the business, he must remain in it formany years in order to get back the costof his equipment, or else be willing totake a loss on the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsewerage, bookyear191
