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Müller, Johann Heinrich. Dissertatio inauguralis De tuba stentorea Germ. Das sprach-rohr quam annuente deo iussu et benevolo indultu amplissimi ordinis philosophici praeside Dn. M. Ioh. Henrico Mullero Philos. Nat. et Mathem. Prof. Publ. pro summis in philosophia honoribus rite consequendis a D. XI April. A.R.S. MDCCXIII publico eruditorum examini subjiciet Christoph. Stephanus Kazaver Heroldsberga-Noricus.
[Altdorf]: Typis Iod. Guil. Kohlesii Acad. Typogr., [1713]. In Latin. 4to. 179 x 147 mm (7 x 5.75 in.). 40 pp., illustrations. Woodcut initial and tail-piece. Bound in modern Italian marbled paper. A dissertation on the history and acoustic principles of 17th and early 18th century amplification devices. The author discusses the “speaking trumpet,” an early megaphone, invented by the English diplomat and spy Samuel Morland. Two woodcut illustrations show the parts and design of this metal sound transmission device. OCLC locates only two copies of this tract in the U.S. VD18 10367101
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