James Gregory and Leonhard Euler arrived at the correct view from a false conception of the achromatism of the eye; this was determined by Chester More Hall in 1728, Klingenstierna in 1754 and by Dollond in 1757, who constructed the celebrated achromatic telescopes.

James Gregory and Leonhard Euler arrived at the correct view from a false conception of the achromatism of the eye; this was determined by Chester More Hall in 1728, Klingenstierna in 1754 and by Dollond in 1757, who constructed the celebrated achromatic telescopes.

James Gregory and Leonhard Euler arrived at the correct view from a false conception of the achromatism of the eye; this was determined by Chester More Hall in 1728, Klingenstierna in 1754 and by Dollond in 1757, who constructed the celebrated achromatic telescopes.

Soc., 1791, 3, p. 3), P.

Report, 1833, p. 360) thus derived the aberrations of the third order; and in later times the method was pursued by Clerk Maxwell (Proc.

The perfect point image in the presence of diffraction had already been described by Airy, as early as 1835.

Nach., 1856, p. 289); in 1840, J.

Petzval (Bericht uber die Ergebnisse einiger dioptrischer Untersuchungen, Buda Pesth, 1843; Akad.

Nach., 1856, p. 289); in 1840, J.

Nachr., 1856, p. 289).

Sitzber., Wien, 1857, vols.

It is impossible to do so perfectly for more than one such pair of planes (this was proven with increasing generality by Maxwell in 1858, by Bruns in 1895, and by Carathéodory in 1926, see summary in Walther, A., J.

Soc., 1874–1875; (see also the treatises of R.

Soc., 1878), the most suitable for visual instruments (optical achromatism,).

Sitzber., 1890, 35, p. 804), H.

Abhandl., 1891, 17, p. 519), who also published a posthumous paper of Seidel containing a short view of his work (München.

Photog., 1891, 5, p. 225; 1893, 7, p. 221), cemented objectives of thin lenses permit the elimination of spherical aberration on the axis, if, as above, the collective lens has a smaller refractive index; on the other hand, they permit the elimination of astigmatism and curvature of the field, if the collective lens has a greater refractive index (this follows from the Petzval equation; see L.

Photog., 1891, 5, p. 225; 1893, 7, p. 221), cemented objectives of thin lenses permit the elimination of spherical aberration on the axis, if, as above, the collective lens has a smaller refractive index; on the other hand, they permit the elimination of astigmatism and curvature of the field, if the collective lens has a greater refractive index (this follows from the Petzval equation; see L.

Kerber (Beiträge zur Dioptrik, Leipzig, 1895-6-7-8-9).

Ber., 1895, 21, p. 410), and particularly successfully by K.

It is impossible to do so perfectly for more than one such pair of planes (this was proven with increasing generality by Maxwell in 1858, by Bruns in 1895, and by Carathéodory in 1926, see summary in Walther, A., J.

Sitzber., 1898, 28, p. 395); a simpler form was given by A.

von Rohr, Theorie und Geschichte des photographischen Objectivs, Berlin, 1899, p. 248).

Gleichen, Lehrbuch der geometrischen Optik, Leipzig and Berlin, 1902).

Abhandl., 1905, 4, No.

Abhandl., 1905, 4, Nos.

It is impossible to do so perfectly for more than one such pair of planes (this was proven with increasing generality by Maxwell in 1858, by Bruns in 1895, and by Carathéodory in 1926, see summary in Walther, A., J.

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