Show A modern blue print outfit the great value of the electric light for blue printing has long been appreciated permitting as it does the production of prints immediately upon the completion of the tracing without inconvenience or delay incident to cloudy or rainy weather realizing the many advantages to be gained mr milton lr oglesby of this city has installed in his office one of the larger sizes of the federal blue printing ma a row of are arc lam lamps ps whereby the proper exposure is made the printing is thus accomplished complis hed automatically and the action of the machine being continuous prints of any size up to the width and length of the apron may be made or separate prints may be made in rapid succession the source of the light being practically constant the speed of the traveling apron may be regulated to suit the sensitiveness k Y chines manufactured by the spaulding print paper company of boston mass the machine is shown in the accompanying cut and consists essentially of a transparent apron forty two inches wide moving around a portion of the periphery of a large drum the motion being communicated from a a small electric motor and by means of a variable speed gear changed at will and always under the control of the operator the tracing and sensitized paper are introduced trod between the apron and the drum sui suitable talle tension applied to the apron keeping a close contact between all four and in this position they are passed in front of of tho the paper used or the degree of transparency of the tracing or original drawing the tension of the apron is likewise controlled and as the apron tracing and paper pass around the surface of the drum which also revolves the contact is perfect and the prints are sharp and clear all kinds of tracings may be used and all kinds of prints blue brown blue line or brown line may be made with equal facility engineers architects and all others interested in blue printing will be made welcome at mr Ogles bys office where he will be glad to show the machine ain in operation |