. The microscope and its revelations. he ball-and-socket joint is for mam-purposes in microscopy, it is not advan-tageously employed in this instrument. Hooke devised the powerful illuminat-ing arrangement seen in the figure, andemployed a stage for objects based on apractical knowledge of what was required. |^! He described a useful method of estimat-ing magnifying power, and was an in-dustrious, wide, and thoroughly practicalobserver. But he worked without amirror, and the screw-focussing arrange-ment seen in the drawing must have beenas troublesome as it was faulty. But as amicroscopist, Ho
. The microscope and its revelations. he ball-and-socket joint is for mam-purposes in microscopy, it is not advan-tageously employed in this instrument. Hooke devised the powerful illuminat-ing arrangement seen in the figure, andemployed a stage for objects based on apractical knowledge of what was required. |^! He described a useful method of estimat-ing magnifying power, and was an in-dustrious, wide, and thoroughly practicalobserver. But he worked without amirror, and the screw-focussing arrange-ment seen in the drawing must have beenas troublesome as it was faulty. But as amicroscopist, Hooke gained a Europeanfame, and gave a powerful stimulus tomicroscopy in England. In 166H a description was publishedin the Giornale dei Letterati of a com-pound microscope by Eustachio Fabri had previously was stated to be about 16^ inchesand adjustable to four different lengths by draw-tubes, giving range FIG. 95.—Divinis compoundof microscope (1(568). K I ;o THE HISTOKV AND DEVELOPMENT OF THE 3IICKOSCOPE. magnification from 41 to 143 diameters. Instead of the usual bi-convex eye-lens, t\\o plano-convex lenses were applied with theirconvex surfaces in contact, by which he claimed to obtain a muchHatter field. .Mr. Mavail found in the Museo Copernicano at Romea answering so closely to this description that he doesnot hesitate to refer its origin to Divini. He made the sketch of it given in fig. the optical con-struction had beentampered with andcould not be esti-mated. Cherubin dOrleanspublished, in 1671, atreatise containing adesign for a micro-scope, of which is an scrolls were ofebony, firmly at-tached to the baseand to the collarencircling the fixedcentral portion of thebody-tube. An ex-terior sliding tubecarried the eye-pieceabove on the fixedtube, and a similarsliding tube carriedthe object-lens below,these sliding tubesserving to focus theimage and regulate(within certainlimits)the al
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
