Patent GB-651254-A (GB)
Title: Improvements in or relating to apparatus for the recording of the readings of temperature and other indicating instruments
Inventor: HARRISON LEONARD WILLIAM
IPC: G03B17/24
Filed: 1947-03-07
Abstract: 651,254. Automatic recording systems. NAPIER & SON, Ltd., D. March 7, 1947, No. 6414. [Class 40 (i)] In an automatic recording apparatus a number of minor galvanometers are connected .to successive groups of condition-responsive transmitters, e.g. thermo-couples and photographic records are taken of groups of five successive sets of readings followed by a pause until another cycle is initiated by a time switch. Every fifty readings, calibrating photos are taken with the galvanometers short-circuited and then deflected to full scale by a potentiometer and local battery. The apparatus may also control a photographic pressure recorder. The control gear comprises four uniselector switches and associated relays. The general functions of the uniselectors are:-K operates in a five-step cycle to control the camera and galvo. lamps; J and M control the successive connection of the transmitters; L controls the calibration potentials. The contact - arms sweep through a complete circle and a duplicate set of contacts (not shown) are arranged in the lower semicircle. Recording operation.-The power supply is established by closing switch T on the control panel, Fig. 2a, so that relay Ya picks up to energize the selector positive bus-bar Y2. Time-switch Xa then operates to energize relays Yb, Yc, Fig. 2b, and send an initiating impulse to driving magnet Ka which interacts with relay Yd to step uniselector K round until the wiper on bank K<SP>1</SP> reaches the dead contact 25. During the rotation in positions 20 ... 22 wiper K<SP>2</SP> energizes the galvo. lamps W<SP>1</SP>a ... W<SP>6</SP>a, Fig. 2d, causing a record to be taken, and in position 23 wiper K<SP>3</SP> energizes relay Ye which gives an impulse to driving magnets Ja, Ma, to connect another group of transmitters such as D, E, F, G, H to the galvanometers, W<SP>1</SP> ... W<SP>6</SP>, and energizes the camera winder. When wound on, camera contacts Xb3, Xb4 energize relay Yg, and make a circuit over Yg<SP>3</SP>, J<SP>1</SP> and K<SP>1</SP>, to start another cycle of uniselector K. This cycle is repeated until wiper J<SP>1</SP> reaches the fifth (dead) contact, when the apparatus stops until a further impulse is received from the time switch. Calibration.-Once every 50 steps wiper J<SP>2</SP> engages contact No. 6 to energize relay Yf, whereby when wiper K<SP>3</SP> engages contact 23 in the next cycle, driving-magnet La is energized instead of Ja and Ma, so that wiper L2 engages contact No. 2, to energize change-over relays Yh, Yj and a record is taken with galvanometers short-circuited. In the next cycle, wiper L<SP>2</SP> engages contact No. 3 to energize change-over relays Yk, Yl, and a record is taken with the galvanometers connected to the calibrating potentiometer N, after which the operation is arrested when wiper L<SP>2</SP> reaches the fourth step. The next initiating impulse from the time switch starts a normal recording cycle and also energizes driving magnet La over L<SP>4</SP> to move selector L ready for the next calibration cycle. On the first and fifth cycle of each normal five. cycle operation, wiper J<SP>3</SP> energizes Ym over L3 and K4 to operate the pressure recording camera Bc. Indicator lamps Wc ... f on the control panel show which operation is in progress.