Editing Polish mine detector (section)

== Design ==
{{cquote|The Polish detector had two coils, one of which was connected to an [[Electronic_oscillator|oscillator]] which generated an oscillating current of an acoustic frequency. The other coil was connected to an [[amplifier]] and a headphone. When the coils came into proximity to a metallic object the balance between the coils was upset and the headphone reported a signal. The equipment weighed just under 30 pounds [14 kilograms] and could be operated by one man. The Polish detector saw service throughout the war and the Mark 4c version was still used by the British Army until 1995.|5|5|Mike Croll|The History of Landmines}}