. The microscope and its revelations. ¢ of 1 lie same firmliving 1-0 Itis supplied with aniris diaphragm ofthe most perfectworkmanship, andthe condenser isfocussed not only byrack - and - pinionmovement, but also?>>/ means of a specialfine adjustment; thisis accomplished 1 >ythe aid of a rotating ring provided with a differential thread, as will IM- seen \>\ examiningthe illustration we give in fig. 248. This allows the condenser tobe easily focussed at intervals of about ()â¢()] mm. By means ofthis fine adjustment the condenser may lie focussed up to about1 mm. Messrs. Swift
. The microscope and its revelations. ¢ of 1 lie same firmliving 1-0 Itis supplied with aniris diaphragm ofthe most perfectworkmanship, andthe condenser isfocussed not only byrack - and - pinionmovement, but also?>>/ means of a specialfine adjustment; thisis accomplished 1 >ythe aid of a rotating ring provided with a differential thread, as will IM- seen \>\ examiningthe illustration we give in fig. 248. This allows the condenser tobe easily focussed at intervals of about ()â¢()] mm. By means ofthis fine adjustment the condenser may lie focussed up to about1 mm. Messrs. Swift and Son make a panachromatic dry condenserhaving a 1 â¢(.), an aplanatic cone of (HIM, and it works well whena critical image is desired. It is well corrected for colour; theyalso make a panaplanatic oil-immersion of 140. with anaplanatic cone of 125. The new optical glass is used throughoutthe system. It is mounted in an adjustable cell, if desired, forcorrecting the variations in the thickness of the glass slide. The x. FIG. 248.â Zeisss centring oil-immersion arliroinutircondenser (ls;i:i . 306 ACCESSORY APPARATUS
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
