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PLAIN RULES WHICH WILL ENABLE ALL TO JUDGE

EXACTLY WHEN, AND WHAT

SPECTACLES

ARE BEST CALCULATED FOR THEIR EYES

OBSERVATIONS

ON

OPERA GLASSES AND THEATRES,

AND AN ACCOUNT OF THE

PANCRATIC MAGNIFIER,
FOR DOUBLE STARS, AND DAY TELESCOPES.

Qui Visum, Vitam dat."

By WILLIAM KITCHINER, M.D.

AUTHOR OF THE COOK'S ORACLE;
THE ART OF INVIGORATING AND PROLONGING LIFE;

THE PLEASURE OF MAKING A WILL;
OBSERVATIONS ON SINGING, &c. &c. AND

EDITOR OF
THE LOYAL, NATIONAL, AND SEA SONGS OF ENGLAND.

LONDON: PRINTED FOR HURST, ROBINSON, & CO. CHEAPSIDE; AND ARCHIBALD CONSTABLE AND CO. EDINBURGH.

1824.

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The Illuminating and Magnifying Powers and Prices of

Newtonian, Gregorian, Cassegranian, und Herschelian Reflectors, and Galilean, Huygenian, and Achromatic Telescopes, of from 3 Inches to 7 Feet Focus, being Calculated and Described in Plain Terms which all Persons may easily understand..

To which will be added, An Appendix from the Writings of Sir Isaac Newton, Sir William HERSCHEL, &c. and Original Communications from Eninent Practical Opticians of the present time, on the Construction and Use of Telescopes.

LONDON:

PRINTED BY J. MOYES, GREVILLE STREET.

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