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PLAIN RULES WHICH WILL ENABLE ALL TO JUDGE
EXACTLY WHEN, AND WHAT
ARE BEST CALCULATED FOR THEIR EYES
OPERA GLASSES AND THEATRES,
AND AN ACCOUNT OF THE
Qui Visum, Vitam dat."
By WILLIAM KITCHINER, M.D.
AUTHOR OF THE COOK'S ORACLE;
THE PLEASURE OF MAKING A WILL;
LONDON: PRINTED FOR HURST, ROBINSON, & CO. CHEAPSIDE; AND ARCHIBALD CONSTABLE AND CO. EDINBURGH.
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.
PRINTED BY J. MOYES, GREVILLE STREET.
III. Cases Of PERSONS WHO COULD NOT
READ IN SPECTACLES .... 20 and 34
The Premature Use of Spectacles, how