Ruxton Multi-Vider drop-lead pencil & slide rule

Rare Otis King Model K - white scales on black background

Pocket Hexadecimal Slide Adder for Computer Programmers

Post 1824 Dring & Fage Alcohol Gauging Rule

Darnley’s Rotable Lightning Calculator/Pencil Case

Lawrence Antenna (classified by UK & US during WWII) for Radar Beam Pattern Detection

Makeba Kombinator pencil & slide rule

Rare Carbic-made Fischer Calculator

For Calculating Strength of Liquids in Twaddells !!

PTT rule for Cable Radio (Signal Loss/dB)

Smallest drum (≈ 2.4m) made by LOGA