[28] Mr. Andrew Ross, the celebrated optician!
[29] The Abbé gave an abstract of this paper in the French journal La Presse, December 28, 1850.
[30] No. 54, Cheapside, and 313, Oxford Street. The prize of twenty guineas which they offered for the best short popular treatise on the Stereoscope, has been adjudged to Mr. Lonie, Teacher of Mathematics in the Madras Institution, St. Andrews. The second prize was given to the Rev. R. Graham, Abernyte, Perthshire.
[31] Edinburgh Transactions, vol. xv. p. 349, 1843; or Philosophical Magazine, vol. xxv. pp. 356, 439, May and June 1844.
[32] Smith’s Opticks, vol. ii., Remarks, p. 107. Harris makes the difference ¹/₁₀th or ¹/₁₁th; Optics, p. 117.
[33] This variation of the pupil is mentioned by Bacon.
[34] Mr. Wheatstone himself says, “that it is somewhat difficult to render the two Daguerreotypes equally visible.”—Phil. Trans., 1852, p. 6.
[35] A sheet of Queen’s heads may be advantageously used to accustom the eyes to the union of similar figures.
[36] See Edin. Transactions, 1846, vol. xv. p. 663, and Phil. Mag., May 1847, vol. xxx. p. 305.
[37] Bibl. Universelle, October 1855, p. 136.