Trade card: Alfred Apps

Early hand break

Compass-clinometer, Bagot's Patent (No 2227 of 1876) by Apps

Electrical register for anemometer

Clinical thermometer in wooden case

Induction coil for use with X-ray apparatus

Alfred Apps, London, 10-inch induction coil

Improved Hawthorn slide rule

Routledge engineer's rule by Alfred Apps, London

Patent section line ruler

Universal shunt

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