Patent GB-966889-A (GB)
Title: Indicator device
IPC: G01P1/08
Filed: 1961-06-13
Abstract: 966,889. Indicating apparatus. FRATELLI BORLETTI S. p. A. June 13, 1961 [June 13, 1960 ), No. 21336/61. Heading G1J. An indicator comprises a coverplate 8 with a fixed scale and a movable tape with an index mark 7, a portion of the tape to one side of mark 7 being divided into parallel strips 6<1>,6<11> of different visual appearance. The window 8<1> in the coverplate 8 has a stepped shape 9 so that strip 6<11> is not visible until index mark 7 has passed a predetermined point (Fig. 3) and the appearance of strip 6<11> acts as a warning. A plurality of parallel strips and a corresponding number of steps in the coverplate 8 may be used to produce warnings for various ranges. A standard coverplate with a window of constant width may be adapted for use with strips such as 6<1>, 6<11> by associating with it a further coverplate.'As shown in Fig. 5 an additional plate is provided as a strip 11 whose position can be adjusted by means of a knob 14. The indicator is applicable to speedometers. Reference has been directed by the Comptroller to Specification 844,575. 966, 916. Theodolites. G. THOREY, and I. KOLB, [trading as OTTO FENNEL SOEHNE KOMM. -GES] Nov. 30, 1960 [Jan. 18, 1960], No. 41140/60. Heading G1F. A theodolite comprises a transparent circle plate 6 (Fig. 2) having a graduated scale 7 indicating degrees and additional coded information 8 adjacent the graduations, this information being a binary code representative of the adjacent degreeindicating graduations, means being provided to project the graduations and the coded information to a common focal plane 55 for recorded. Zenital light is reflected by a mirror 9 and passes through a prism 10 to the circle plate 6. The optical system 11, 12, 13 transfers the image of the degree indicating graduation line from one side of the circle plate to the diametrically opposite position at 7 where an intermediate image is produced in the plane of the graduation. This image and the graduation at 7 are projected by an objective 15 into the plane of a glass plate 16 which is marked with an index line. The rays of light pass through prisms 14, 18 and through a parallel plate 17 which is tiltable by operating a knob 20. This shifts the image of the circle graduations relative to the index line on the glass plate 16 until the index line bisects the light gap between a pair of graduated lines, each originating from diametrically opposite positions of the circle plate. A scale 19 on which the sub-graduation of the graduation lines is arranged is rigidly connected with the parallel plate 17,the indication of the scale 19 being read at the same index line on the glass plate 16. The circle graduation images and the indication of the scale 19 are observed through a microscope eye piece 25. The code 8 is illuminated by a light source 26, the light passes through a prism 27. An image of the code 8 is then projected by an objective 28 through the parallel glass plate 17 and a prism 29 to the plane of a glass sector 30 on which coded values 31 are arranged which correspond to the graduations of scale 19. On tilting of the parallel plate 17 to bisect the light gaps,the image of the code 8 is projected by an objective 36 (Fig. 3) through prisms 34, 35 and 37 to an image plane of a mask 38. A data input means is provided such that readings obtained by additional measuring procedures and identification data of points to which the coded indications are to be correlated can be set manually and observed visually in decimal digits in a window 41 by the operator. The input of numerical values is carried out with the aid of slides 39 marked with figures 0 to 9. Small glass rods 46 are connected to the slides 39 and are marked with suitably coded decimal figures. The code on the rods 46 is illuminated by the light source 26 via prisms 47, 48, 49 and projected by an objective 53 through prisms 50, 51, 52 into the plane of a mask 54. A camera represented by an objective 56 takes photographs of the code images in the masks 38 and 54 through crossed prisms 55. Electronic pick-up means such as photo diodes may be provided for recording the digital information.