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Description: | Slide rule for calculating level errors. Slider marked "POSITIVE" "NEGATIVE". On either side of the slider are the fixed pieces. One is marked "ABOVE THE POLE" and then on another part of the same piece it is marked "SCALE OF CORRECTIONS OF TRANSITS IN SECONDS OF TIME FOR LEVEL ERROR IN SECONDS OF ARC LATITUDE 51 degress 28' 39'' NORTH". The other fixed piece is marked "BELOW THE POLE" and elsewhere on the same piece, 'STARS NPD BELOW THE POLE". The back of this slide rule is blank.
caption: Record Shot - Do not reproduce. | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | astronomical slide rules Airy Royal Greenwich Observatory George Biddell Troughton & Simms | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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