. The microscope and its revelations. Fui. 117.—C. Che\ < limmatic microscope i i-ii ca 1 *•.; I . Barlow, 31 r. Ooddtngton, andseveral others, worked more or less :,t, the general subject. Cod-dington alone, however, mutined his attention to the microscope, • his work was limited to the eyepiece. AKo, for some years, »eph .). Lister had been earnestly \\orking ex peri mentally andthematically on the same subject . and he discovered certain pro-perties in an achromatic comhinat ion. which \\< -re of importance,ough they had not been before In I-S29 a paperreceived and publishe
. The microscope and its revelations. Fui. 117.—C. Che\ < limmatic microscope i i-ii ca 1 *•.; I . Barlow, 31 r. Ooddtngton, andseveral others, worked more or less :,t, the general subject. Cod-dington alone, however, mutined his attention to the microscope, • his work was limited to the eyepiece. AKo, for some years, »eph .). Lister had been earnestly \\orking ex peri mentally andthematically on the same subject . and he discovered certain pro-perties in an achromatic comhinat ion. which \\< -re of importance,ough they had not been before In I-S29 a paperreceived and published 1,N the Royal Society,2<• principles it laid down into ractice, Lister was • btain a coml)ina1ion of ,. p. capable of transmitting ai Trans, Eoy. FIG. 118.—One of Rosss early microscopes designed by W. Valentine (1831) I52 THE HISTORY AND DEVELOPMENT OF THE MICROSCOPE pencil of 50° with .-• large corrected field. This paper and itssuits exerted a very powerful influence on the immediate improve- resi rneiit of English achro-matic object-glasses, andformed a permanent-basis of advancement forthe microscope, not onlyin its optical, but alsoindirectly in its me-chanical constructionand refinements. For convenience, atthis point we may ad-vance a little in orderto complete our briefoutline of the mechani-cal application of achro-matism to A. Ross becamepractically acquaintedwith the principles ofachromatism as appliedto combinations of lensesin working with Pro-fessor Barlow on thissubject, and having ap-plied Listers principleswith great success, hediscovered, as we havealready pointed out inCh. I.,1 that by coveringi lie object under exami-nation by a thin film ofglass or talc the correc-tions Avere distur
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