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shoe magnet. In order to register the wave form cor rectly, the galvanometer needle should move across the cylinder in a practically straight line, and, in order to diminish the arc, it is disposed as shown in the plan view. The galvanometer has a short needle attached to the movable part, while above and independently of it, is mounted a second and longer needle of alUmi nium, which is pivoted upon a heavy base outside' the instrument. and provided with a counterweight. The galvanometer needledoi:10.1038/scientificamerican04231904-23666supp fatcat:mzqzqea36fgpxohjyf6iqgxbee