. American engineer and railroad journal . isengage the feed at the desired points. The automatic tripoperates at as many different points as there are depths to bedrilled at one setting of the work, and in addition it leavesthe spindle free, after any intermediate tripping, to be ad-vanced or raised and advanced or traversed its entire lengthwithout disturbing the set of the dogs. It also throws outthe feed when the spindle reaches the limit of its machines are made by the Bickford Drill & Tool Coml>any, Cincinnati, Ohio. EVERETT-McADAM CONTINUOUS ELECTRIC BLUEPRINTING MACHI
. American engineer and railroad journal . isengage the feed at the desired points. The automatic tripoperates at as many different points as there are depths to bedrilled at one setting of the work, and in addition it leavesthe spindle free, after any intermediate tripping, to be ad-vanced or raised and advanced or traversed its entire lengthwithout disturbing the set of the dogs. It also throws outthe feed when the spindle reaches the limit of its machines are made by the Bickford Drill & Tool Coml>any, Cincinnati, Ohio. EVERETT-McADAM CONTINUOUS ELECTRIC BLUEPRINTING MACHINE. In practically all modern drafting rooms the old method ofblue printing by sunlight has been very largely abandonedin favor of a machine printing by means of electric many advantages of the later method in the matter ofconvenience, rapidity and expense are so evident that it isnot necessary to repeat them. From its first stage, where the electric light was simplysubstituted for sun light, the ordinary printing frames and. TRACING DIAGRAM SHOWING METHOD OF PRINTING. other apparatus being used, this system of blue printing haspassed through several stages of development, each newmachine having some important points of advantage over Itspredecessor, until at present it would seem impossible to im-prove the efficiency or rapidity of making blue prints overthan that obtained with the latest machines. One of the latest and most modern of these blue printingmachines, which has only been on the market for about oneyear, is that manufactured by the Revolute Machine Company of 523 W. 45th Street, New York, to which the Illustra-tions herewith refer. This machine consists briefly of a rotating glass cylinderwhich lies in a series of narrow belts and within which areplaced two mercury vapor electric lamps. The roll of paperto be printed is placed in the box at the top of the machineand feeds in continuously between the belts and the cylinder,or If only a few prints of small s
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
