. American engineer and railroad journal . ssed 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
. American engineer and railroad journal . ssed 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 size are wanted, previouslycut sheets of paper may be fed in. The tracings are insertedbetween the paper and the glass cylinder, and after passing. i:\fcttETT-MC ADAM CONTINUOUS ELECTRIC BLUE-PRINTING around three-quarters of the circumference of the cylinderthey are printed and deposited in the box with the paperlocated in the front of the machine below the cylinder. Thecylinder is driven through gearing by an electric motor andits speed of rotation, and hence the length of time given tothe printing can be varied at will. A unique feature of the machine is the use, of a number oi1%-in. belts instead of a single broad one. In this way absolutely perfect contact is obtained, which was found to beimpossible by the use of a single broad belt. The mercuryvapor electric lamps are particularly well adapted for thiskind of work, as they give out only chemical rays. Thelamps are so situated that the light strikes the paper at rightangles at all times, and the machine has a maximum electri-cal efficiency. The whole machine is very compact, requiring a space ofonly 2x5 ft., and is entire
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
