| 摘要 |
<p>718,671. Calculating-apparatus. EDDOWES, C. S. Sept. 24, 1952, No. 23985/52. Class 106 (1) A time indicator comprises two relatively rotatable discs 1, 2 carrying co-operating scales 4, 5 divided into equal one-hour divisions which are marked with numbers and letters respectively, in sequence. The letters represent different hours, Greenwich Mean Time. The scale 4 is marked from 1 to 12 (A.M.) and from 1 to 12 (P.M.) and a similarly marked scale 6 may be added to the disc 2. the centre of which is drided into a black (P.M.) zone and a white (A.M.) zone. Scales of longitude.3, 7 may also be marked on the discs. In another arrangement, the scales may each ,have twelve divisions only, the one being marked 1 to 12 and the other A to L and also M to X. The device,- which is made of white plastic material, may be mounted on a radio or television receiver.</p> |
