000568043 000__ 02831cam\a2200325\\\4500 000568043 001__ 568043 000568043 005__ 20210716161202.0 000568043 006__ m\\\\|o\\d\|\\\\\\ 000568043 007__ cr||n||||||||n 000568043 008__ 950301s1775\\\\enk||||\o\\\\\00||||eng\c 000568043 035__ $$a(Uk-ES)006318522 000568043 035__ $$a(OCoLC)642546658 000568043 035__ $$a(CU-RivES)T224122 000568043 040__ $$aUk-ES$$cUk-ES$$dCStRLIN$$dCU-RivES$$dCengage Gale 000568043 1102_ $$aP. and J. Dollond 000568043 24510 $$aDescription of the two feet and half achromatic telescope,$$h[electronic resource] :$$bMade by P. and J. Dollond, in St. Paul's Church-Yard, London. The object-glass of this Telescope is composed of two glasses, one convex of crown glass, and the other concave of white slint glass; the diameter of the aperture is two inches. The plate represents the Telescope on its stand: AA is the wooden tube 2 1/2 feet long. The tube BB, that contains four eye-glasses, to be used for land-objects; and also the tube C, that contains two eye-glasses for astronomical purposes, are to be serewed into the end of the brass tube D. By turning the button a, this tube moves out of the wooden tube to adjust the eye-glasses to the proper distance from the object-glass, so as to render the object distinct. The magnifying power with the eye-glasses for land objects is near 50 times, and with those for astronomical uses it is 80 times. The stained glass b is applied to the eye-tube C to guard the eye in observing the spots on the sun. This glass must be taken off when the eye-tube is used for any other purposes. The vertical and horizontal motions are given to the Telescope by means of the joints at c and d. Description de la lunette Achromatique de Deux Pieds et Demi, Fait pair P. et J. Dollond, dans la Cimitiere de St. Paul a Londres. 000568043 260__ $$a[London :$$bs.n.,$$c1775?] 000568043 300__ $$a1 sheet :$$bill. ;$$c1⁰. 000568043 500__ $$aParallel English and French texts. 000568043 500__ $$aAbove the text is an engraving of the telescope. 000568043 500__ $$aReproduction of original from British Library. 000568043 506__ $$aAccess limited to authorized users. 000568043 509__ $$aP. and J. Dollond = P. and J. Dolland who traded from 1766-1804. 000568043 5104_ $$aEnglish Short Title Catalog,$$cT224122. 000568043 533__ $$aElectronic reproduction.$$bFarmington Hills, Mich. :$$cCengage Gale,$$d2009.$$nAvailable via the World Wide Web.$$nAccess limited by licensing agreements.$$7s2009 miunns 000568043 650_0 $$aTelescopes$$vEarly works to 1800. 000568043 752__ $$aGreat Britain$$bEngland$$dLondon. 000568043 852__ $$bebk 000568043 85640 $$3Eighteenth Century Collections Online$$uhttps://univsouthin.idm.oclc.org/login?url=http://find.gale.com/ecco/infomark.do?contentSet=ECCOArticles&docType=ECCOArticles&bookId=1095300800&type=getFullCitation&tabID=T001&prodId=ECCO&docLevel=TEXT_GRAPHICS&version=1.0&source=library&userGroupName=usi$$zOnline Access 000568043 909CO $$ooai:library.usi.edu:568043$$pGLOBAL_SET 000568043 980__ $$aEBOOK 000568043 980__ $$aBIB 000568043 982__ $$aEbook 000568043 983__ $$aOnline