Early Boxwood Slide Rules

Four Sides Four Slides Gauger's Slide Rule (c1770)

Two Sides Two Slides Alcohol Slide Rule (c1840)

Two Sides One Slide Alcohol Slide Rule (c1840)

Carpenter's Folding Slide Rule (Rabone) (c1860)

Cylindrical Slide Rules

Fuller Calculator - Type I (1954)

Otis King's Pocket Calculator - Model K (1960)

Circular Slide Rules

Russian Circular Slide Rule KL - 1 (1968)

Keuffel & Esser Slide Rules

N4053-3 (c1937)

4081-3 (c1958)

Adding Machines

Lighting Adding Machine (1953)

Arithma Addiator (c1962)

Faber-Castell Addiator 111/54A Darmstadt (c1963)