Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 137
point in the edge with the finger, that point is made anode, a new sound is produced, and a new system of nodallines developed. 461. By clampingthe plate at other pointsthan the centre, newtones and nodal linescan be produced. Thetones will be purewhenever the clampingpoint is an aliquot partof the… … *A brass plate is usually made circular: a glass plate, square.
Physics
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![An illustration from M. Vitrvvii viri svae professionis pertissimi De architectvra libri decem, ad Avgvstum Cæsarem accuratiss. conscripsit & nvnc primvm in Germania qva potuit diligentia excusi, atq[ue] hinc inde schematibus non iniucundis exornati (1543)](https://img.insideoutlibrary.com/img/200/ia-mvitrvviivirisva00vitr-97-26.webp)
