Scientific Instruments > Navigational

Brass Parallel Rolling Rule In Original Mahogany Box by Hall Harding London.

Item#: SNI502

SOLD

 

This little used large rolling rule with bevel edges was used as navigation aid equipment for large sea charts. Made of solid brass with rollers that allow it to track parallel lines of position over a chart. The rule comes in its original fitted mahogany box and Measures 46 cm (18 ¼ inch) long and 7 cm (2 ¾ inch) wide. Hall Harding Ltd was a London-based manufacturer and supplier of drawing-office equipment.