Letters to Editor | Published:

A Completely Supraconducting Galvanometer

Naturevolume 135page906 (1935) | Download Citation



SINCE it was thought that interesting experiments might be performed if it were possible to measure quantitatively persistent currents in a supraconducting circuit much smaller than have so far been detected with a magnetometer, there has been constructed in this laboratory a completely supraconducting moving-coil galvanometer. The coil consists of 100 turns of fine lead wire, connected by leads of lead to the experimental circuit. The coil is suspended in the liquid helium by a rigid wire connected above the cryostat to an ordinary galvanometer suspension and mirror. With this arrangement the suspension remains nearly at room temperature. The coil is completely shielded from moderate external magnetic fields by placing it inside a supraconducting cylinder of sheet lead, and thus is subjected only to the controlling magnetic field from a pair of copper coils within the cylinder.

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  1. McLennan Laboratory, University of Toronto

    • E. F. BURTON
    •  & F. G. A. TARR


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