. Bulletin of the scientific laboratories of Denison University. OF DENISON UNIVERSITY. 9 the stationary sound-waves in a vibrating stretched string. As in Lecher's experiments, a small Geissler tube without electrodes, placed between the remote ends of the parallel wires, glowed brilliantly. A short wire placed across the parallel wires in general caused the light to cease, but positions could be found such that the tube still continued to glow. Three such positions were found with the appara- tus used. These were separated by etpial intervals and marked nodal positions, any interval giving t
. Bulletin of the scientific laboratories of Denison University. OF DENISON UNIVERSITY. 9 the stationary sound-waves in a vibrating stretched string. As in Lecher's experiments, a small Geissler tube without electrodes, placed between the remote ends of the parallel wires, glowed brilliantly. A short wire placed across the parallel wires in general caused the light to cease, but positions could be found such that the tube still continued to glow. Three such positions were found with the appara- tus used. These were separated by etpial intervals and marked nodal positions, any interval giving the half wave-length of the undulations in the wires. The ends of the wires and of the secondary plates form ventral segments in the resonance system. H. Rubens^ had succeeded. Fig. I. in measuring not only the length but the form and amplitude of such waves by use of the instrument devised by Paalzow and himself and named the "; I used the same instrument em- ployed by Rubens in his study of stationary waves in wires. Fig. 2 shows its construction. -^1 R'l R,s R\ are the resistances of a balanced Wheatstone bridge. Two of these, R\ R 2, are themselves balanced bridges, each of their four arms being a very fine iron wire about 10 cm long and of seven ohms resistance. Suppose the whole system balanced, and a weak but steady current supplied by the battery B. The galvanometer shows no deflection. Evidently if alternating cur- rents produced by electrical oscillations enter by the wires ww' they will circulate only in the minor bridge R 2, but will disturb the balance of the main bridge by the heating effect in R 2. This disturbance, if ' H. Rubens, Wied. Annalen, Vol. XLII, p. 154, (1891.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Denison University; Denison Scientific Associat
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