5.1 Pre-1900

Number of slide rules: 9.

Year Maker Model
1809 Jacob and Halse Sector
c.1840 noID Gunter Rule
c.1850 Davies Routledge Engineer
c.1880 noID Comparative Rule
1883-1902 Dring & Fage Inland Revenue Rule
c.1898 K&E American/Favorite
1898-1900 Faber 365
1898-1925 E.S.A. London Harrow Mark Reducer
1899-1902 Faber 367