Patent GB-136760-A (GB)
Title: Improvements in and relating to Maps and Charts, for Land, Air and Water Transport and in Holders, Fitted with Rollers or Spools for Carrying the said Maps when in use.
Inventor: FULTON FREDERICK WILLIAM
IPC: G09B29/06
Filed: 1919-05-29
Abstract: 136,760. Fulton, F. W. May 29, 1919. Maps.-Relates to carriers for strip maps showing land, water, and air routes, and includes roller apparatus for displaying and traversing maps superposed in pairs, an indicator arrangement for estimating distances on the maps, means for attaching the map sections together and to the rollers, and other map details. (1) Two maps 18, 23, Fig. 3, are carried respectively by pairs of rollers 21, 22 and 26, 27, which are normally out of gear with winding-shafts 5, Figs. 3 and 4, common to the adjacent pairs of rollers, and are braked by a spring and washer 16. The shafts 5 are movable endways into two positions, determined by a detent 7, 8, to engage a clutch face 9 with a loose gear-wheel 10 co-operating with a gear-wheel 11 associated with the corresponding roller. The gear-wheel 11 is on a sliding sleeve 11<a>, which can be engaged with the roller by means of clutch faces 13, but is normally retracted by a spring 14, and is advanced by means of camfaces 13<a> on rotation of the gear-wheel 11. (2) The carrier is rotatably mounted on a bracket provided with a turntable having a notched edge cooperating with a spring detent. (3) A cover frame 55, Fig. 5, having a transparent top is provided with longitudinal and transverse indicators 35, 28 divided into black and white sections in relation to the scale of the maps, for estimating distances on the maps. The transverse indicator 28 is stationary, and constitutes a pinion spindle for gearing together two drums 31, 32, either of which can be rotated by hand for traversing the longitudinal indicator 35 by means of cords 33, 34. (4) The sections of the lowermost map 18, Fig. 9, are detachably linked together and to the rollers at each end by means of loops 46 and cross-bars 47, 45 on the map sections and on tags 44 attached to the rollers; the loops and crossbars are provided in duplicate as shown, for alternative use in case of breakage. The sections of the upper maps of one or more superposed pairs are similarly linked together, but the roller tag is extended as an open-work frame by means of side bands 51, 52, Fig. 3, and a cross-network 54 in relation to the scale of the map may be included for the uppermost map of the series. Similar open-work connexions may be used between the map sections. (5) The lowermost map shows the main route in continuity, angular displacements being made where necessary by means of interpolated triangles ABC, Fig. 9, and connecting- lines D. The upper maps show local details, and are marked in correspondence with the mainroute map by means of circles numbered at the road intersections, as shown in Fig. 9, for a mainroute map. Main and other routes are distinguished by colouring or lining. Names are printed two or more times reading from different directions. On the local maps, street names read in the direction corresponding to the rule of the road. For use with air and water maps, a transparent celluloid or gelatine sheet having the constellations marked in white or in luminous paint is provided.