Newton's figure of his reflecting telescope with explanationsIsaac Newtonc.321 wordsThe Newton ProjectFalmer2014Newton Project, University of Sussex
This text is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
c. 1672, in English, c. 326 words, 2 pp.2 pp.
Published in Philosophical Transactions of the Royal Society, No. 81 (25 March 1672), pp. 4004-4007.
Letter to Henry Oldenburg, 19 March 1671 [EL/N1/36]An Accompt of a New Catadioptrical Telescope invented by Mr. Newton [Philosophical Transactions 81 (25 March 1672)]
in English
EL/N1/37, Royal Society Library, London, UKUKLondonRoyal Society LibraryEL/N1/37c. 1672EnglandLatinHolographUnknown Cataloguer (1)Unknown Cataloguer (2)Unknown Hand (3)ScienceOpticsCorrespondenceTranscription by Daniele CassisaCode audited by Michael Hawkins
37Newton 337
Read Jan: 11: 167
Entd. LB. 5. 98. & RB. 4. 123.Explicatio Figuræ.AB. Speculum concavum metallicum, fundo Tubi adhærens, cujus radius (13. digit.digitorumAnglic.Anglicorumferé).CD. Speculum metallicum planum ovale, bacillo ferreo affixum, et circulo æneo, intra Tubi cavitatem mobili, insertum.F. Lens vitrea, cujus latus superius planum, inferius convexum, radius autem circiter digiti. semissisMetalluum quippe colligit Solis radios ad distantiam digitorum, et lens ocularis, ad dig.digitorum feré distantiam ## ab ejus vertice. Exploratæ etiam mihi sunt dimensiones eorum ex vasis, in quibus elaborata fuêre; speciatimque diametrumricum concavi hæmisphærici, in quo elaborata fuit Lens vitrea, dimensus, eam digiti esse deprehendo.GGGG. Pars Tubi Anterior, circulo æneo HI. firmiter constricta, ita ut non facilé moveri possit.PQKL. Pars Tubi posterior, circulo æneo PL immobiliter infixa.O. Uncus ferreus, Circulo æneo PQ affixus, ultra Tubi Axem extensus, cui clavus cochleatus N immissus, Tubi partem posteriorem antrorsum pellit, vel retrahit, ad speculorum debitam distantiam investigandam, parte priori fixâ remanente.NMGI. Ferrum curvatum, quod Tubum sustinet, Globo ligneo S, clavi R adminiculo, affixum.Centrum speculi plani CD locatur in Axe Tubi, ita ut in ipsam perpendicularis, à centro Lentis demissa, cum axe angulum rectum constituat, et objecti species, à speculo concavo in idem repercussa, versùs lentis focum E reflectatur. ✝ ✝ Conferendo distantias foci istius à verticibus lentis, et speculi concavi, h.e. EF dig.digiti et ETV digdigiti; prodit ratio 1. ad 38; quâ indicatur, objecta 38. vicibus circiter ampliari.Corona ferrea, ventilogio, ornamenti ergo, imposita, 300. circiter pedibus distans, cùm uno oculo, huic Tubo admoto, spectabatur, altero in charta subjecta, 11. circiter digitis ab ipso distante, magnitudine, et figura, A insignitâ, apparebat. Tubus autem vulgaris, 25 digit.digitorum longus, lente objectivâ convexâ, oculari veró utrinque concavâ (cujus radius est 2. digitorum) oculo admotus, figurarumm coronæ, magnitudine B, eadem observatâ chartæ ab oculo distantiâ, altero oculo exhibebat: consentientibus post repetita ExptaExperimenta DD. Brounker, Wren, Hook.37–