. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. That Really Teach you the things you want to know, and in asimple, practical way that you can understand Our illustrated catalogue, which will be sent you free uponrequest, tells all about the Practical Mechanical Books for Home Study that we are popular pricedbooks on the operation oftrains and station work, prac-tical mechanical drawing andmachine designing, patternmaking, electrical railroading,power stations, automobiles,gas engines, electrical wiring,armature and magnet winding,dynamo t
. The 20th century toolsmith and steelworker; a complete, practical, and scientific book. That Really Teach you the things you want to know, and in asimple, practical way that you can understand Our illustrated catalogue, which will be sent you free uponrequest, tells all about the Practical Mechanical Books for Home Study that we are popular pricedbooks on the operation oftrains and station work, prac-tical mechanical drawing andmachine designing, patternmaking, electrical railroading,power stations, automobiles,gas engines, electrical wiring,armature and magnet winding,dynamo tending, elementaryelectricity, wireless telegraphyand telephony, carpentry andarchitecture, concrete con-struction, plumbing and heat-ing, sign and house painting,amusements, etc., matter what your ambi-tion or desire for knowledgemay be, we publish books written by authorities intheir different lines that will give you just the training andinformation that you want and need. Write today for this up-to-date and complete illus-trated catalogue and popular price list. It is FREDERICK J. DRAKE & CO. PUBUSHERS OF SELF-EDUCATIONAL BOOKS 132S Michigan Avenue CHICAGO DEC 23 1912 Twentieth CenturyMachine Shop Practice By L. ELLIOTT BROOKES M\M The best and latest and mostprafctical work published en mod-ern machine shop practice. Thisbook is intended for the practicalinstruction of Machinists, Engin-eers and others who are interestedin the use and operation of themachinery and machine tools in amodern machij e shop. The firt-tportion of the book is devoted topractical examples in Arithmetic,Decimal Fractions. Roots of Num-bers, Algebraic Signs and Symbols,Reciprocals and Logarithms ofNumbers, Practical Geometry andand Mensuration. Also AppliedMechanics—which includes: Thelever. The wheel and pinion, Thepulley. The inclined planes, TheWedge The, screw and safety valve—Specific gravity and the velocityof falling bodies—Friction, BeltPulleys and Gear wheels. Properties
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