A dial map measurer; unsigned; but attributed to one of the Frodsham family of watchmakers. Also; a divider; written note and map. The dial map measurer is 55mm. in diameter. Map distances measured by the rotating wheel are transmitted to the dial hands which give readings in miles; chains; furlongs and hundredths of a mile. In a leather case. Chartometer.Ca. 1840.From: Map meter.Maps. C. 4. a. 4. (8)London; British Library.
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