Patent GB-840377-A (GB)
Title: Phototypography
IPC: B41B17/02
Filed: 1956-07-09
Abstract: 840,377. Phototypographic apparatus. RONDTHALER, E., and HORMON, H. July 9, 1956 [July 13, 1955], No. 21186/56. Class 98(1) In a phototypographic apparatus having a member with two parallel guideways, a photographic stencil provided with a slanting index for each character thereon is slidable in one guideway and an index device with a reference member having at least one circular index is slidable in the other guideway, and means are provided for varying the distance of said circular index from a line parallel to the guideways for justifiying purposes. As shown, the stencil 10 is a photographic film having two rows of transparent letters on an opaque ground and two slanted index lines 18, 19, associated with each letter. This stencil is slidable in a guideway 25 formed on a stiff transparent sheet 22 which is also formed with a parallel guideway in which an index device 26 is slidable. The index device 26 comprises a base plate 40 with a cut out 45 in one edge, a bar 41 pivoted -to plate 40 and having a slot 55 fitting over a headed screw 44 threaded into a stop post 43 on plate 40, and a transparent reference disc 42 which rests on the plate 40. This disc has several reference circles 49 on its periphery, and also a series of identifying numerals 50 to indicate the circle which is to be used with lettering having substantially the same point size as the numeral. Also provided for use with the stencil and index device is a transparent spacing member 27, Fig. 3, having two scales 28 and 29; scale 28 is graduated according to the point system of type sizes while scale 29 is divided into 100 equal parts, each tenth division is labelled and the zero point is spaced from the edge 32 by approximately the same distance as the opaque part of the stencil from the longer edges thereof. In use, the index device 26 and the spacing member 27 are first placed in the guideways 23 and 25 respectively, with the number on scale 29 (e.g. 5) appropriate to ideal spacing between the stencil letters positioned centrally of the cut out 45 in the index device 26. Disc 42 is now rotated until the appropriate reference circle (e.g. 18) is centred under the chosen number 5 on scale 29, whereupon a thumb nut 54 is tightened so that bar 41 holds disc 42 fast. Spacing member 27 is now removed and stencil 10 is placed in guideway 25 before the sheet 22 is positioned on light sensitive paper 20 with the left hand side of the first stencil letter to be recorded aligned with a line 60 on the paper 20. The index device 26 is then moved to centre the circle numbered 18 under the index 19 of this letter. The stencil is subsequently moved to centre the index 18 of the next letter over the circle numbered 18. This procedure is repeated until the remaining letters of the word to be composed have been spaced off and the total distance occupied is measured and compared with the distance it is desired that this word space occupy. The difference is determined as by the points scale 28 on spacing member 27 and then divided by the number of spaces in the word to give in points (e.g. 3) the distance to be added or subtracted from the spacing originally set. Spacing member 27 is then replaced in guideway 25 and nut 54 is loosened so that disc 42 can be moved radially to position the reference circle numbered 18 under the appropriate new division number (e.g. 8) on scale 29 with the result that the movement of device 26 in its guideway 23 required to register the circle 18 with the two index lines associated with each stencil character is appropriately different. This setting of the index device 26 is now maintained while the index device and stencil are alternately shifted to expose the paper 20 to light passing through the selected stencil letters so as to record a word with the desired length. An alternative way of incorporating the new spacing is described in which the disc 42 is first attached to the bar 41 by an adhesive layer on the underside thereof and then adjusting the position of stop post 43 so that a movement of bar 41 between the screw head 44 and post 43 will move reference circle numbered 18 laterally through the additional spacing, as measured by point scale 28 on spacing member 28. The letters are then photographed as before by alternately shifting the stencil and indexing device but each time the latter is moved the bar 41 is pivoted into contact with the stop 43.