Patent GB-110374-A (GB)
Title: Improvements in Telegraphy.
Inventor: WITHERS JOSEPH SUTTON
IPC: H04L25/26
Filed: 1916-09-14
Abstract: 110,374. Withers, J. S., (Cox, K. C.). Se pt. 14, 1916. Selenium-cell and like optically-sensitive relays. - The lamp, the condenser, the slide for subdividing the beam, the receiving galvanometer, and the cells of a selenium-cell relay of the kind described in Specification 399/14 are adjustably mounted upon a common base and with the exception of the lamp are enclosed in an airtight chamber. Lamp mounting. The lamp 20, Figs. 1, 2, and 3, is adjustably supported on a pillar 40 mounted on a foot 39, the position of which is adjusted by means of a slide 42 and is secured in position by means of a nut 43. The lamp is provided with a hood 44 hinged in brackets 45. The slide 42 is made in a saddle 35 which also carries the condenser 21 and lightdividing slide 22 and which is adjustably mounted on the base 31 and secured in position by screws 38. Condenser and optical-slide mountings. The condenser 21 and slide 22, Figs. 1, 2, 3, 6, and 7. are mounted on a plate 41 carried by the saddle 35 and, in order that the lines of the projected image of a grid 73, Fig. 9, may be readily adjusted to be parallel to the lines of sub-divisions of the selenium cell, the slide is mounted between a fixed V guide 62 and a movable V guide 63 which is pressed on to the slide 22 by a spring 66, the guide 63 being provided with short slots 65 through which the retaining studs 64 pass. The guides 62, 63 are mounted on a ring 68 carried in a circular opening in the plate 41 and adapted to be rotated against the action of a spring 72 by means of a screw 70, or by means of a tangent screw and a worm-wheel. The slide and guides are enclosed in a tube 74; while the light passing through the condenser 21 may be split up by opaque bands painted on the slide instead of by the grid shown in Fig. 9. Lens mounting. The lens 23, Figs. 1, 2, and 3, is mounted in a tube 46 rigidly attached to a bracket 36<1> carried by a saddle 36. The saddle 36 is finely adjusted in position by means of a screw 47 mounted on an adjustable plate 48 and rotated by means of a milled head 49 through bevel-gearing. A coarse adjustment of the lens is obtained by moving the slide 36 and plate 48 which are retained in their respective positions by means of set-screws 51 and 50. The bracket 36' carries a conical screen 52. Construction and adjustment of galvanometer recorder. The galvanometer coil 25 and its mirror 26, Figs. 10 and 12, are mounted on a suspension piece 76, the base 76<a> of which is provided with depending lugs 78 through which pass horizontal rods 77, and the base 76<a> is held in position by means of a clamping-screw 79. The upper part of the suspension pieces is held by a screw 80. The lower end of the coil 25 is held in an aluminium clip 82 to which is attached the upper end of a phosphor-bronze strip 83, the lower end of which is attached to an adjusting spring 84. The upper end of the coil 25 is held in a clip 81 provided with light cross-arms to which the mirror 26 is attached by wax. The clip 81 is threaded by a phosphor-bronze wire 87 which passes over two grooved rollers 88, mounted on pivoted arms 90, and around a roller 89. The roller 89 is mountedon an adjustable block 93 by means of which the height of the coil 25 is adjusted, while the block 93 and the pivoted arms 90 are mounted on a table 95 which is revolved by means of a worm wheel 96 and a tangent screw 97. The coil 25 is adjusted by means of the pivoted arms 90, the wheel-supporting ends of which are forced apart by a spring 92 and forced towards each other by screws 92<1>. The lateral adjustment of the field magnets is effected by screws 76<c>. The galvanometer is mounted on a base-plate 57 which is adapted to be rotated about a stud 56, Fig. 3, placed at the point of intersection c, Fig. 2, of the optical centre line a b and the centre line of the arm 55 which carries the selenium cell 27. The stud 56 is mounted on an adjustable saddle 37 and is rotated by a worm sector and a tangent screw 59. The plate 57 is held in its adjusted position by means of screws 58 which pass through slots 59<1> in the base 57 and engage the saddle 37. Selenium-cell mounting. The cell 27, Figs. 1, 2, and 3, is mounted on a bracket 54 adjustably mounted on an arm 55 pivoted cn the stud 56. The arm 55 is locked by a screw 60 sliding in a slot 61 in the saddle 37. Instead of mounting the slide 22, Figs. 6 and 7, so that it may be rotated through a small angle, the cell 27 may be mounted to give a small angular adjustment. Casing and circuit connexions The apparatus is enclosed in a casing 99, Figs. 2 and 3, the back 100 of which is secured to brackets 101 provided with lugs 103 to which the casing is hinged. The opening in thu back 100 adapted to receive the tube 74 is cut larger than the tube and a feltlined ring 104 which fits the tube 74 is pressed against the back 100, thereby ensuring relative lateral movement between the casing and tube. A similar joint is made by a piece 105 where the Lase 31 passes into the casing 99. The casing is provided with glazed doors 107 having blinds or shutters. The leads to the galvanometer coil pass through a hole 108 in the base 34 to a shunt box 109 and thence to the coil. The leads to the magnet coils are connected to terminals 111 and thence to terminals 110, while the cell leads are connected to terminals 112 and thence to the terminal board 113.