Instruction booklet for Seyler's coal calculator Instruction booklet for Seyler's coal calculator Measurements: overall: 2 x 142 x 217 mm Materials: paper Object Number: 1997-863 Pt1 type: pamphlet Image © The Board of Trustees of the Science Museum
Seyler's coal calculator Seyler's coal calculator Measurements: overall: 4 x 228 mm Materials: plastic and complete Object Number: 1997-863 Pt2 type: ready reckoner Image © The Board of Trustees of the Science Museum
Burroughs Class 4 1000 hand operated adding and listing machine with keyboard for Sterling currency (calculating machine (printing, full-keyboard, adding))