An electromagnet consisting of two vertical, cylindrical coils (external diameter 13 cm) on a nucleus of soft iron bent into a U and equipped with horizontal cylindrical pole pieces (diameter 4.3 cm), perforated longitudinally (hole diameter 1 cm), whose reciprocal distance can be regulated.
This electromagnet, with its pole pieces perforated, could also be used to study the rotation of the polarization plane of a beam of light polarized rectilinearly when it crosses, in the direction of the field, certain materials (for example a cylinder of flint glass) placed in the magnetic field generated by the electromagnet (the Faraday effect).

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