Stamped brass tag reads: " A. Van Emden / Kolverstaat E. 227 Amsterdam." Field supplied by two pair of electromagnets mounted in same vertical plane. Disk type armature of brass with 8 steel nuts on each side. Connections for rotating geissler tube on arm (29.5 cm long). Reference: Groenendijk Catalogue, page 20, item 5h-19.
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