Two antique slide rules made of boxwood. From the top:
An excise officers slide rule very similar to the 1739 modification
that Charles Leadbetter made to the gauging rule of Thomas Everard.
With three sliders. English c.1750. Ticket Price: £550.
A four slider gauging rule with Vero’s modification made by
“EDWRd ROBERTS Maker Dove Court Old Jewry LONDON” English c.1780.
(Robert was working 1749-84, 1788-96). Ticket Price: £490.
