Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 471
er of air, diflerentiated from the air adjacent bytemperature or moisture; while a succession of such sheets ofcalico may be taken to represent successive layers in non-homo-geneous air. Two tin tabes, M N and O P (fig. 3), with open, ends were Fig. 3. … placed so as to form an acute angle with each other. At the end of one was the vibrating reed r; opposite the end of the other, and in the prolongation of P 0, the sensitive flame/, a » Phil. Trans. 1874, pt. i. p. 208, and Lecture VJT. of this volume. APPEXDIX 11. 449 second sensitive flame (/)…
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