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3. On Aplanatic Telescopes, a posthumous paper by the late Archibald Blair, Esq

Published online by Cambridge University Press:  16 March 2015

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Extract

In this paper a new fluid composition is proposed for correcting chromatic aberration, free from the corrosive properties of those used by the author's father Dr Blair, the inventor of the fluid object-glass. The composition proposed is:—

The secondary spectrum formed by the nitrate, combined with crown-glass, is similar to that when flint and crown glass are combined. The combination of crown-glass with the muriate is the opposite. Hence, by properly combining these, Mr Blair states that the secondary spectrum may be wholly destroyed.

Type
Proceedings 1836–37
Information
Proceedings of the Royal Society of Edinburgh , Volume 1 , 1845 , pp. 158
Copyright
Copyright © Royal Society of Edinburgh 1844

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