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OCR: [75] might be broughe to fafficient perfection, wereic noc for the differene refrangibiliry of(everalforsofRays. Buc reafon afthis different refrangibility Ido not other means improving Telei icopes by Refractions alone than that increaling their lengths, for vhich end the late coatrivance feems weli accommodated. For very Jong Tubes are and kearce to be readily put reafon their length are very bend, and thake by bending caufe continual trembling in the Obicets, hereby becomes difficule them diftinaly whereas by his contrivance the GlafTes are readily and the Objeet.Glafs being fixt frong uprighe Pole becomes more Secing thercfore the improvement ofTelelcopes ot given lengths by Refraltions IS defperare contrived heretotore Perfpective refexion, ufing inftead of Objeet Glaf concave Meral. ...