Secrets of wise men, chemists and great physicians (1889)
David, Wm. K. (William King) · Chicago : Wm.K. David · leaf 99
FIG. 2.—THE SPEAKING GLASS CASE. it passes till it reaches the suspended head at A, as shown by the dottedlines, E, D, C, B, A. The voice thus transmitted is reflected from tliesides of the trumpet, H, to the person holding a conversation witli thebead. … FIG. 3.—THE INVISIBLE GIRL EXPERIMENT. This experiment, which is analogous to the one that precedes, wasexplained by Nicholson, in 1832. in his Journal dr Phyxique. Althoughat first off(*rf(l aH a physical oxperiiin-nt, under the title of an experi-■ tieiit in acoustics, it has nince changecl…
Recipes · Tricks · Medicine -- Formulae, receipts, prescriptions
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