Halley's Magnetic chart

Scale: circa 1:35,000,000. Facsimile. Reproduction of Halley's world map with isogonic lines, on one sheet. Mercator's projection. George Biddell Airy, then Astronomer Royal, felt that it would be valuable to reproduce this chart, which was requently referred to in works on magnetism, but very difficult to find. A reduced version of this chart was included as an appendix to the Greenwich Observations for 1869. This chart has Airy's signature on it.

Object Details

ID: G301:1/70(1)
Collection: Charts and maps
Type: Chart
Display location: Not on display
Creator: Vincent Brooks Day & Son Ltd
Date made: 1870
Credit: National Maritime Museum, Greenwich, London
Measurements: Overall sheet dimensions: 60.7 cm x 129.5 cm
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