Variation Indicator for Navigator's Parallel Rule, English, 19th Century
|Inventory Number:|| 52743|
|Object Type:|| |
|Place Created:|| England United Kingdom Europe
|Brief Description:||See 37414 for another example, with complete instrument.|
Square base plate with bevelled edges divided to 8 ungraduated equal parts and with divided circle of 4 quadrants, with cardinal points labelled. Mounted 7mm above base on a central shaft is a circular disc with a divided compass rose subdivided to 128. The disc can be fixed at any orientation by a knurled knob.
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