Capt Fields Improved Navigators Parallel Ruler (0624)
Index: 0624
Year: 2nd half 19th century
Maker: Aston & Mander
Dimensions: 38 x 2 x 7 cm
Info
Capt FIelds made improvements to the then traditional navigation ruler adding the protravtor scale and compass points.
Assume maker is Aston & Mander as the ruler bears the logo, but there is no name. Aston & Manders company was established in London around 1780 and specialized in the making of instruments for drawing, navigation, surveying and other.
References/Links/More Info
Wikipedia about parallel rulers
