Catalog of stereopticons, motion picture machines, projection apparatus : manufactured and imported by the McIntosh Stereopticon Company . of the track tubes as desired. This hinge-like movement of the supportsis of great convenience, since it enables one to change quickly from one kind ofprojection work to another. The cut illustrates the lantern with the cooling tank and projectionmicroscope in position ready for use, but teacher desire toproject lantern slides, the supports carrying the cooling tank and projec-tion microscope are swung over towards the operator, and the supportsc
Catalog of stereopticons, motion picture machines, projection apparatus : manufactured and imported by the McIntosh Stereopticon Company . of the track tubes as desired. This hinge-like movement of the supportsis of great convenience, since it enables one to change quickly from one kind ofprojection work to another. The cut illustrates the lantern with the cooling tank and projectionmicroscope in position ready for use, but teacher desire toproject lantern slides, the supports carrying the cooling tank and projec-tion microscope are swung over towards the operator, and the supportscontaining the slide stage and the regular objective (both partiallyshown in the cut) brought forward into optical line with the condens-ing lenses and illuminant. All sorts of apparatus suitable for projection can be used on thebridge pieces, such as slot and diaphragin attachments, prism support,mirrors, lenses, chemical tanks, polariscopes and crystal stages. Anattachment for opaque projection (see page 2()) can readily be usedtvith this lantern. 40 Mcintosh stereopticon co., Chicago, ill., u. s. a. IMPROVED COLLEGE BENCH FOR PRICES SEE PAGE 41. A lantern having a condensing lens of fixed focal length is incapable ofproducing the best results when used with objectives having a great variationin focal length for instance, an objective of long focus used with lantern slides,and a high power microscope objective of extreme short focus; to make it pos-sible for the operator to easily and quickly substitute one condensing lens foranother, even after the lenses have become heated, we have adopted a newmethod of mounting, each lens being contained in a separate brass ring soananged that it can be easily slipped into place and fastened securely in but afew seconds of time. The advantages of this construction are 1st—That the equivalent focus ot the condensing lens system can bechanged at will by substituting one lens for another of difierent focal length,thus giving the o
Size: 1826px × 1368px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidgricatalogof, bookyear1915
