Patent GB-190920769-A (GB)
Title: Improved Method of Making Photographic Prints and Devices for the same.
Inventor: BARBERIS GIUSEPPE SILVESTRO
IPC: G03B27/02
Filed: 1909-09-10
Granted: 1910-07-14
Abstract: 20,769. Barberis, G. S. Sept. 10. [Addition to 20,585/09.] Contact printing-frames.-The clips described in the parent Specification, for pressing the printing-paper between the negative and a glass plate, are modified in the following respects. (1) The elbow or projection which is in contact with the back plate is obtained by bending the central part of the clip at a right-angle, the arm on which the elastic band is supported being connected to one or both sides of the clip, which is suitably strengthened and provided with notches or hooks on which the non-elastic cord is engaged. (2) The projection or elbow is provided with a fixed or detachable device for altering the height of the projection to obtain different heights of the projection, and thus obtaining different inclinations of the clip with regard to the plane of the plate. The detailed modifications are as follows. (1) In the construction shown in Figs. 5 and 9, the elbow is replaced by a projection q stamped up from the body of the clip ; and the arm f<3>, ever which the elastic band rests, is connected to the clip by one edge. The edges are strengthened by folded edges r. The notches s are formed at the outer end of these edges, round which the non-elastic cord is passed. (2) In the construction shown in Fig. 11, the elbow or projection q is stampedup from the centre, and both sides of the clip are strengthened by wings t. The non-elastic cord with this clip is passed over hooks u, one of which has a notch u<1>. The stitched end of the elastic band is passed through the hooks f<4> and folded back under the notch u<1> so that, to lesson the tension, the band is released from the notch u<1>, and slips through the hooks f<4> until stopped by the thickened stitched end. (3) In the construction shown in Fig. 13, the projections q are stamped-up from the sides of the clip, and have two claws n<1> to fix a plate for increasing or varying the height of the projection. Alternative methods for varying the heights of the projections are as follows. (a) With the construction shown in Fig. 13, plates are cut for giving two different heights according to the way they are put in. (b) A plate x<2>, Figs. 17 and 17<A>, is eccentrically pivoted on the projection, and gives four different heights according to its four positions. To keep the plate in position, a wire stirrup x<3> is housed under the claws f' and kept in place by the elastic band. (c) A flattened ring y, Fig. 19, with a notch y<1>, and with wings y<2>, y<3>, cut as shown at z, z<1>, is slipped on the projection q. The various notches co-operate with the projection f<8>, Fig. 5, according to the way it is slipped on, and determines the height of the projection. (d) Or a movable piece is conveniently mounted behind the projection and is capable of being raised by a wedge between it and the base of the clip. This movable piece may be bent flat, and up at the edge to keep the plate h, Fig. 5, in position, thereby dispensing with the springs i. (5) An alternative device for supporting the plate h consists of an elastic ring which embraces the plate h and the extreme edge of the clip. (6) In the construction of clip described in the parent Specification, the hooks f<4>, f<7> for the elastic band are formed by folding over projections left on the side of the clip. The clips as modified intercalate with each other in pairs, as described in the parent Specification.