Patent GB-340565-A (GB)
Title: An improved method of and apparatus for illumination with a continuous play of colours
IPC: F21V9/40
Filed: 1929-10-02
Abstract: 340,565. Colour lighting. LANDIS ET GYR SOC. ANON., 1, Hofstrasse, Zug, Switzerland. Oct. 2, 1929, No. 29821. Convention date, Jan. 8. [Class 75 (iv).] Lighting, systems of ; lantern screens.-In a system of colour lighting a series of differently coloured lights are successively emitted, the transition from one colour to the next being effected below the maximum intensity of the successive lights, and during the change of colour there is additional illumination with white light. The intensity of the white supplementary light may be regulated to increase from an initial value up to a maximum value and then decrease to a final value, and its duration may be shorter than that of the successive coloured lights. In the form shown in Fig. 1, an electric lamp bulb 10 with a parabolic reflector 14 is arranged behind a colour screen which is rotated by means of an annular gear 22, a worm 25, and a motor 27. The colour screen comprises two relatively large segmental pieces 29, 291 of slightly ground but of distinctly different coloured glass or like material separated by relatively narrow segmental pieces 30 of slightly ground uncoloured glass, the width of which is slightly less than that of the reflector 14. In the form shown in Fig. 4, shutters 46, 47, 48 are slidably mounted directly in front of compartments containing electric lamp bulbs 40, 41, 42, the shutters 46, 48 having coloured transparent areas 49 and opaque areas 50 separated by areas 51 of varying opacity gradually changing from opaque to transparent, whilst the shutter 47 only has an opaque area 52 and a transparent area 53 for controlling the white supplementary light. Connecting- rods 67 attached to the shutters carry rollers 66 adapted to co-operate with grooves in cams 62, 63, 64 fixed to a shaft 56 which is rotated by means of gearing 61 and a motor 60. Figs. 6, 7, and 8 show the shapes and relative arrangement of the cams to produce the desired rhymic movement of the shutters. In the form shown in Fig. 9, three coloured electric lamp bulbs 70, 71, 72 and an uncoloured bulb 73 are connected in circuit with conducting strips 75, 75<1>, resistance strips 76, 761, 82, and insulating strips 77, 77<1>, 84. These strips are traversed by sliding contacts 78, 78<1>, 81 connected with the crosshead 79 of a yoke 80 which is driven backwards and forwards bv means of a disc 80<1> driven by a motor 80<11>. The latter may also drive a switching drum 90 having an insulating surface in which are embedded conducting strips 91 connected in circuit with the coloured bulbs 70, 71, 72 so as to produce the following sequence of coloured lights, 70, 71, 72, 71, 70, 71, 72, 71, 70 &c. Various details of suitable arrangements are given in the Specification including the arrangement of the lamps in groups, the provision of stand-by lamps which are brought into circuit when required by electromagnetic relays, the use of a fixed number of lamps provided with a motor contact mechanism for connecting them alternately in series, seriesparallel, parallel, series-parallel, and in series, and the operation of the coloured screens and shutters by means of electromagnetic relays.