Edward Roberts Boxwood Excise Officer's Slide RuleThis rare 18th century Excise Officers slide rule has scales on all four sides and has three slides. The maker's name and address, Edward Roberts Grocers Alley Old Jewry London is clearly marked on the inside. The condition of the antique slide rule is good, all three slides move freely. This wonderful Georgian item has been in a private collection for over 60 years, a fantastic gift idea for the collector. A rare precision instrument by a renowned