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Details and Image
Type | Model No. | Maker | Country | Construction Material | Date | Scale Length | Area of Use |
Disk | Meridiograph | Louis Ross | "San Francisco, U.S.A." | Metal | 1917 to 1927 | Dia. = 17.4 cm | Surveying |
Notes: "1) Used to calculate true north from sun position measurements. 2) See Vol 25, No 1 pg 7-9 Journal of the Oughtred Society for a details about this slide rule."
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