41. Info 2 For Ramsden Page Thornes, York, England Dwelling Brandy Carr Source FHL Film 1342105 PRO Ref RG11Piece 4581 Folio 10 Page 14 Rel Mar Age Occ Birthplace jesse ramsden Head M http://www.geocities.com/jccglass/yorks/raminfo4.html

Info 4 for Ramsden, Census Close info Window 1881 Census Place: Alverthorpe Cum Thornes, York, England Dwelling: Brandy Carr Source: FHL Film 1342105 PRO Ref RG11 Piece 4581 Folio 10 Page 14 Rel Mar Age Occ Birthplace Jesse RAMSDEN Head M 50 Mkt Gadnr Brandy Carr Mary RAMSDEN Wife M 49 Wrenthorpe William S. RAMSDEN son U 27 Mkt Gdnr Brandy Carr, Benjamin RAMSDEN son U 19 Mkt Gdnr Brandy Carr, Elizebeth A. RAMSDEN dau U 21 Brandy Carr Harriet RAMSDEN dau U 18 Brandy Carr, Percy RAMSDEN son U 14 Brandy Carr, Phillis RAMSDEN dau U 12 Brandy Carr, Edward RAMSDEN son U 10 Brandy Carr, Eva RAMSDEN dau U 6 Brandy Carr, 1891 census 1901 Census Wakefield district RG13 piece 4288 folio 10 page12 Alverthorpe,Wrenthrope,St Ann Vine Cottage Name rel age occ born Joseph Ramsden Head 53 Market Gardener Brandy Carr Sarah J. Ramsden wife 53 Bradford Mary Ramsden dau 21 Brandy Carr Saville H. Ramsden son 19 Market Gardener Brandy Carr Ada Ramsden dau 13 Wakefield Harold Ramsden son 11 Wakefield

42. Barometro Meteorologia Su Scovato! Translate this page 3- Meteorologia. 3.1. - Barometro con Termometro (ramsden) jesse ramsden, Londra,1789. mogano, vetro, mercurio. altezza complessiva = 1 m. stato discreto http://www.scovato.it/servizi/meteo/barometro meteorologia.html

showAdv('up') Home Page Aggiungi ai Preferiti Imposta Home Contatti ... Proponi un Sito ..: Directory Principali :.. A tavola Bellezza e Benessere Casa Computer ... Videogiochi ..: Gli Scovatissimi :.. Articoli Sportivi Alberghi Milano Arredamento Download Giochi ... Pavimenti Abbiamo scovato Barometro Meteorologia Sono stati scovati i seguenti risultati di " Barometro Meteorologia "; ecco quelli da 1 a 20: Ti consigliamo di visitare i risultati della ricerca di rilevante per la pagina in cui sei ora Avventurosamente - Meteorologia ... Meteorologia spicciola. Ogni Escursionista dovrebbe essere in grado di interpretare i segni del tempo e di leggere un barometro ... del suo variare. Il barometro ha una scala di lettura ... www.avventurosamente.it meteorologia Le previsioni del tempo. La precisione della previsione del tempo dipende in gran parte dalla conoscenza che il previsore ha del maggior numero possibile di dati relativi allo stato generale dell'atmosfera. ... barometro, del termometro e di ... www.vicenzanews.it Barometro registratore OSSERVATORIO ASTRONOMICO DI PALERMO GIUSEPPE S. VAIANA. 3- Meteorologia. 3.18. - Barometro Registratore (Richard) Richard Frères, Parigi, fine XIX-inizi XX secolo. ottone, acciaio, mogano. dimensioni cassa = 28, 5 x 16 x 13 cm. stato: ottimo ... me...

43. Browse: View Similar Resources; jesse ramsden (17351800) View Full ICON Record URL http//micro.magnet.fsu.edu/optics/timeline/people/ramsden.htmlGrade Level 6-12 http://icontechlit.enc.org/external/icon_standard_browse_index/0,5275,version%3D

44. Antique Telescope By Jesse Ramsden 18 th Century Telescope by jesse ramsden. This is a great example of a late18th century telescope by the famous instrument maker jesse ramsden. http://www.hubbletelescope.btinternet.co.uk/ramsden.shtml

th Century Telescope by Jesse Ramsden This is a great example of a late 18th century telescope by the famous instrument maker Jesse Ramsden. He was born in Halifax in 1731 and he died in Brighton in 1800. All of his work is of the highest standard, which is evident when using this telescope. The achromatic objective lens is shown above in its brass surround. This unscrews using the knurled ring to allow access to the back of the glass for cleaning. Ramsden employed over 50 men, but he was said to have undertaken the construction of the most delicate instruments himself. The telescope is made of brass and mahogany. These were typical telescope making materials from the 18th century, especially for marine use. The photograph above shows the barrel, and the screws that attach the wood to the brass. At the front there are four screws, and at the opposite end of the barrel there are six screws. Not only is this telescope in superb working order, it also has its original leather case. I believe that it is original as it fits so well and slides in and out very smoothly. The eyepiece end of the telescope is shown in the two photographs above . The protective shutter rotates around a pivot and does not slide along straight tracks. The eyepiece design employed is known as the "Ramsden" as it was developed by Ramsden earlier in his life. A variation of Ramsden style eyepieces, the Kellner, is still used in telescopes today.

45. Liceo Foscarini - Museo Virtuale Di Fisica: Macchina Elettrica Di Ramsden Translate this page vari perfezionamenti compiuti sulle macchine elettrostatiche a strisciamento ?rappresentatodal modello inventato verso il 1770 da jesse ramsden (1735 - 1800 http://www.liceofoscarini.it/fisica94/ramsden.html

elettromagnetismo elettrostatica Macchine elettriche ScriviLogo ('') Macchina elettrica di Ramsden ScriviInizio (538) di Francesco Cobres Datazione ScriviDatazione (538, 14) Questa pagina richiede Javascript Il culmine dei vari perfezionamenti compiuti sulle macchine elettrostatiche a strisciamento è rappresentato dal modello inventato verso il 1770 da Jesse Ramsden (1735 - 1800) che venne largamente usato per circa un secolo. Usando una terminologia moderna se ne descrive qui di seguito il funzionamento. Il disco di vetro di due piedi di diametro (un po' meno di 610 millimetri), messo in rotazione per mezzo di una manovella, si carica positivamente per strofinio con i cuscinetti di feltro ad esso aderenti su ambo i lati, i quali si caricano negativamente. Per il fenomeno dell' induzione elettrostatica le cariche inducono sulle punte del conduttore ad “U” una carica negativa per addensamento dei suoi elettroni. Le punte sono usate per amplificare l'induzione elettrostatica, dato che esse aumentano il campo elettrico che si forma tra il disco di vetro e le punte presenti sui due conduttori metallici paralleli alla superficie di vetro e terminanti con due palline di materiale isolante di colore bianco. Nel conduttore, dunque, lo spostamento dei suoi elettroni verso le parti terminali dei due bracci a “U” ad opera dell'induzione fa comparire dall'altro lato, quello delle sfere, una carica positiva.

46. Sito Ufficiale Translate this page Fu progettata e costruita presumibilmente verso il 1780 nell’officina del celebreottico e meccanico londinese ramsden-jesse (1735-1800), discepolo di J. http://www.igmi.org/Pages/strumenti.html

STRUMENTI Telescopio Gregory. È uno strumento di osservazione, ovvero un cannocchiale, costruito dall’ottico Ribright di Londra verso la metà del 1700, ma lo strumento porta il nome dell’astronomo inglese Gregory, che lo progettò nel 1660 circa. Esso proviene dall’Officio Topografico del Regno delle Due Sicilie e si compone di due specchi concavi disposti in modo da dare l’immagine “diritta” dell’oggetto collimato. Ha un ingrandimento che non supera i 20 diametri circa. Compasso di proporzione o di Galilei. Copia di un antico strumento di misura, il suo impiego è illustrato dallo stesso Galilei nel trattato “Le operazioni del compasso geometrico et militare”. Lo strumento, molto usato in passato per la risoluzione di problemi di geometria pratica, anche sul terreno, è costituto da due aste o regoli di reggetta d’ottone riuniti a cerniera in modo che possano chiudersi o aprirsi da a 180 gradi; sulle due facce delle aste sono tracciate le linee con le opportune divisioni e numerazioni per la risoluzione o facilitazione di problemi riguardanti la linea e la sua divisione, le corde, la costruzione di un dato numero di poligoni inscritti nel medesimo cerchio, i calibri dei pezzi d’artiglieria in relazione al peso della palla o proiettile, il peso del proiettile in relazione al suo diametro, ecc.. Cerchio ripetitore di Borda . Fu costruito tra il 1802 ed il 1825 dal francese Bellet, discepolo di Lenoir. Con questo strumento si eliminava l’errore di graduazione da cui erano affetti i quadranti, gli ottanti ed i sestanti in uso fino ad allora.

47. I3047: Sarah Ann HOGBEN (ABT 4 Nov 1824 - 18 Aug 1869) HTML created by GED2HTML v3.6WIN95 (Jan 18 2000) on 12/20/2003 103249 AM GMT StandardTime. Mary ramsden. - . jesse Henry SAWYER. ABT 1862 - AFT 1881. http://www.dennishayden.me.uk/g0000547.html

Sarah Ann HOGBEN ABT 4 Nov 1824 - 18 Aug 1869 BIRTH : ABT 4 Nov 1824, Kent. CHRISTENING : 4 Nov 1824, St. Nicholas, Rochester, Kent. DEATH : 18 Aug 1869, Everleigh Arms, Woodchester, South Australia. BURIAL : Woodchester, South Australia. REFERENCE Father: ! HOGBEN Mother: Family 1 Edwin Charles MAIDMENT MARRIAGE : 22 Nov 1843, Crafters Hotel, Adelaide, South Australia. Sarah Ann HOGBEN INDEX HOME HTML created by GED2HTML v3.6-WIN95 (Jan 18 2000) on 12/20/2003 10:32:49 AM GMT Standard Time Judith LAISNE REFERENCE Father: Jean LAISNE Mother: R! NICOLLE Family 1 H! MARTEL _Jean LAISNE _Jean QUERTIER _Marie FICQUET ... HOME HTML created by GED2HTML v3.6-WIN95 (Jan 18 2000) on 12/20/2003 10:32:49 AM GMT Standard Time Raymond Edward LOWNE This person is presumed living. INDEX Charles Walter MAIDMENT BIRTH : 1862, Wokingham, Berkshire. REFERENCE Father: Charles MAIDMENT Mother: Rebecca FUTCHER _Robert MAIDMENT _John MAIDMENT _Joshua MAIDMENT ... HOME HTML created by GED2HTML v3.6-WIN95 (Jan 18 2000) on 12/20/2003 10:32:49 AM GMT Standard Time Robert MANBY BIRTH DEATH REFERENCE Father: John MANBY Mother: Elizabeth BOBY _Sarah SHIPP Robert MANBY INDEX ... HOME HTML created by GED2HTML v3.6-WIN95 (Jan 18 2000)

48. Index 154. raking cornice molding, 552 72 Ralph, Bill, 541 37 Ramapo ManufacturingFactory, 531 14 ramsden, jesse, 553 112 rams horns http://www.eaiainfo.org/subQ2Z9702.htm

Index A B C D ... Home Q Qualcast, quarries Portland brownstone, quarry workers rules for, wages, work day, Quartermaster General, Union Army hand knitting for, Quayle, Olive, Quebec planes, Quebec Cullers' Act, Queen tile spades, Quidex, J. B., quilts design, early power loom fabrics, Marseilles white work, wedding, A B C D ... Home R rabbet planes, skew, rabbets escapement, rabbet shaves, rabbit felt hats, racing yachts. See also schooner yachts Fortuna, "Rack-and-Pinion Plow" (Whelan), racks (threading gins), cover, radio screwdrivers, railroad picks, beryllium, railroads coal industry and, craftsmen, diesel age, iron-tired wheels, n. narrow-gauge locomotives, Southern Railway repair facilities, standardized measurements and, raking cornice molding, Ralph, Bill, Ramapo Manufacturing Factory, Ramsden, Jesse, rams horns for shepherds crooks, Randolph, Thomas Mann, Randolph, Virginia Jefferson, Ransomes lawn mowers, Raposa. Peter, Rapp, George, "Rare Event, A: A Paintbrush Survives the Nineteenth Century" (Kinsey), rasps

49. Manufacturers jesse ramsden (17351800). He was probably the best manufacturer of scientificinstruments of the 18th century, well known throughout Europe. http://albinoni.brera.unimi.it/HEAVENS/MUSEO/Schede/ramsden.html

Jesse Ramsden (1735-1800) In 1775, Ramsden produced the first dividing machine that could be effectively used to trace precise divisions on the borders of small diameter circles. For this invention, which represented significant progress in precision mechanics, he received a donation from the Board of Longitude Commissioners in 1777. He was elected a member of the Royal Society in 1786, and in 1794 became a member of the Imperial Academy of St. Petersburg. In 1795, he was awarded the Copley Medal, one of the most prestigious recognitions of the period. List of the instruments: 11 - Mural quadrant References: C.C. Gillispie (ed.), Dictionary of Scientific Biography , 14 vols., (New York: C. Schriber's Sons, 1970-1976)

50. Costruttori Translate this page jesse ramsden (1735-1800). Fu probabilmente il miglior costruttore distrumenti scientifici del XVIII secolo, conosciuto in tutta Europa. http://albinoni.brera.unimi.it/CAELUM/MUSEO/Schede/ramsden.html

Jesse Ramsden (1735-1800) Elenco degli strumenti: 11 - Quadrante murale Riferimenti: C.C. Gillispie (a cura di), Dictionary of Scientific Biography , 14 voll., (New York: C. Schriber's Sons, 1970-1976)

51. CHS 12th Grade A Pass Parker, Santana Perham, Jared Platt, Mara Poole, Heather R Preston, Erica L Quinn,Jennifer Quinta, Kimberly R Radley, Dustin M ramsden, jesse Rasha, Stephanie http://www.camdenschools.org/chs/APass12-2.htm

12th Grade A Pass Applebee, Travis Robert Armstrong, Benjamin Jac... Babcock, Stacy Marie Baker, David Michael Beck, Wayne Robert Best, Ashley Alexis Boulerice, Matthew Ian Briggs, Mary Elizabeth Campbell, Sarah L Choquette, Amanda Lorr... Clark, Laura Elizabeth D'Entrone, Joseph Vito Eastup, Samantha Joel Finster, Corey Andrew Fox, Katie Marie Gambier, Jonathan Mich... Grinnell, Zacharia Joseph Grzesik, Stephen W Hallock, Meaghan Ashley Hite, Alisha Meagan Hollibaugh, Meghan Mau... Holmes, Ian Daniel Hopkins, Jennifer Alicia Hurd, Erin Melissa Janovsky, Sarah Lynn Johnson, Jordan Patrick Johnson, Tracy Scott Kimball, Molly R Kohli, Kari Larkin, Thadeous M Lessels, Carley Loiacono, Joshua Losurdo, Dustin Mellon, Chelsea A Messmer, Rafaela J Metott, Samantha Mock, Joshua P Morse, Deborah A Mutch, Corey Parker, Brian Parker, Santana Perham, Jared Platt, Mara Poole, Heather R Preston, Erica L

52. HighBeam Research: ELibrary Search: Results travelled to observatories in England and France to obtain advice and equipment,and met such great astronomers as William Herschel, jesse ramsden and Nevil http://www.highbeam.com/library/search.asp?FN=AO&refid=ency_refd&search_dictiona

53. HighBeam Research: ELibrary Search: Results not realized until a century later, when jesse ramsden noted that it also partlycancelled 14. EYES, BRIGHT Similes Dictionary; July 1, 1988 http://www.highbeam.com/library/search.asp?FN=AO&refid=ency_refd&search_dictiona

54. Vision Engineering Optical Microscopy Glossary Of Terms R. ramsden, jesse (17351800) An English optician and inventor ofthe ramsden ocular. ramsden Eyepiece An ocular consisting of two http://www.visioneng.com/technology/glossary.htm

Home Profile Company Profile Company History ... Z A Abbe, Ernst (1840-1905) A man who accomplished more to further the interests of scientific microscopy than any other individual. His inventions include the apochromatic objective, the compensating ocular, the Abbe condenser, a well-corrected oil-immersion achromatic condenser, the immersion objective, Abbe apertometer, and the drawing camera; he evolved the Abbe theory of image formation, the numerical-aperture formula, and other optical theories. Aberration Any errors that result in image degradation. Such errors may be chromatic, spherical, astigmatic, or comatic, and can result from design or execution, or both. In an optical system, the aberration of light refers to the straying away of rays from their appointed courses. These errors, unless corrected, tend to produce a hazy image and give rise to spherical aberration, coma, astigmatism, curvature of field, distortion, and longitudinal and lateral chromatic error. Aberration, Chromatic

55. Making The Modern World - Theodolite This initial project subsequently grew into the national Ordnance Survey.jesse ramsden was one of the foremost instrumentmakers of his age. http://www.sciencemuseum.org.uk/on-line/mmw/theodolite.asp

search visiting exhibitions online let's talk ... technology in everyday life making the modern world Source: Ordnance Survey The Age of Enlightenment, 1750-1820 Ramsden’s Three-foot Theodolite, 1791 Ramsden’s theodolite was used for measuring the angles in the Primary Triangulation of Great Britain. This was the first accurate survey of Britain and formed the foundation for the Ordnance Survey maps of the country. The huge project was initiated by General William Roy, who had advocated a national survey since 1763. The government at first declined, on grounds of cost, but the impetus to start finally came from a French request to the Royal Society to collaborate and measure the relative positions of the London and Paris observatories. This enterprise appealed to the scientific spirit of George III who helped to fund the work. This initial project subsequently grew into the national Ordnance Survey. Jesse Ramsden was one of the foremost instrument-makers of his age. Two Ramsden theodolites were used in the survey and the first could take a bearing on a mark 70 miles away with an error of only 1/180th of a degree. This, the second instrument, was even more accurate. Despite their great weight, the theodolites were carried to the tops of mountains, steeples and specially-built scaffolds to obtain lines of sight. The measurements taken during the survey were so accurate that they were used for the next 150 years. Next top-ten icon: Universal Milling Machine NMSI Contact Us ... Site Map

56. Science Museum London - Treasures Dividing, or marking, the scales on the instruments by hand was slow and demanding,so that when in 1775 jesse ramsden produced a successful machine that could http://www.sciencemuseum.org.uk/on-line/treasure/objects/1932-22.asp

Troughton's Dividing Engine In the 1760s two practical methods for finding longitude at sea, a major navigational problem, had been proposed. However, both methods required accurate angle-measuring instruments. Dividing, or marking, the scales on the instruments by hand was slow and demanding, so that when in 1775 Jesse Ramsden produced a successful machine that could perform the task mechanically he was well rewarded. The dividing engine on display was completed by John Troughton in 1778 and is similar to Ramsden's original machine. Troughton's engine was similar to Ramsden's second dividing engine, shown here. The engraving is taken from Description of an Engine for Dividing Mathematical Instruments by Jesse Ramsden, 1777. Inventory Number: 1932-22 Astronomy and optics Chemistry Classical physics Communications ... Water transport

57. > > L'eStudiolo De Pèndulum > > Translate this page Materiales cobre, latón, vidrio, estaño, madera de bubinga y nogal americano,seda y cuero. Dimensiones h= 28cm. Diseño jesse ramsden, 1766. http://www.pendulum.es/estudiolo/electricidad_magnetismo.html

INICIO PEDIDOS CATÁLOGO Electricidad y Magnetismo Electricidad y Magnetismo Pila de Volta Elecroscopio Pararrayos Pila de Volta PILA DE VOLTA Carta de Alessandro Volta a la Royal Society de Londres. Marzo de 1800. "El aparato de que le hablo y que indudablemente le asombrará a usted, no es más que una colección de buenos conductores de clases diferentes dispuestos de cierta manera, 30, 40, 60 o más trozos de cobre (o mejor de plata), cada uno descansando sobre trozos de estaño o mejor de zinc, y un número igual de capas de agua o de algún otro fluido que sea mejor conductor que el agua pura, tal como agua salada, lejía, etc., o trozos de cartón o cuero bien empapados en estos líquidos. Esto es todo lo que constituye mi instrumento." Pieza confeccionada a mano.

58. Ciência Em Portugal - Episódios of an engine fordividing mathematical instruments, Londres, 1787. Reis,A. Balcão...... Translate this page Rees, Londres, 1819. ramsden, jesse, http://www.instituto-camoes.pt/cvc/ciencia/e20e.html

Cultura Portuguesa Pedro Nunes, Mercator e Escher Pedro Nunes e a Astrologia Francisco Sanches - O Elo Perdido Os Nomes Portugueses de Al-Khuarizmi O Instrumento de Sombras O Picante dos Descobrimentos Galileu em Portugal O Fogo de Santelmo O Lume Vivo O Cometa do Vinho do Porto A Estrela de Cabral Vida breve O aluno de Madame Curie Entre o Porto e Recife O fabuloso Museu da Marinha Serendipidade Bibliografia de Nicolas Bion, Paris, 1725. Biblioteca Central da Marinha, Lisboa. . Stadtbibliothek, Nuremberga. BIBLIOGRAFIA Bird, John, Method of dividing astronomical instruments , Londres, 1767 Brahe, Tycho, Astronomiae Instauratae Mechanica Wandesburgo, 1602 Brahe, Tycho, Dani Mundi Aetherei Recentioribus Phenomenis Liber secundis , Praga 1610 Carvalho, Joaquim de, para a Arte de Navegar , in Obra Completa , Lisboa, 1987, vol V, pag 341-370 Carvalho, Joaquim de, Pedro Nunes, Obras , vol II, De Crepusculis Carvalho, Joaquim de, , in Obra Completa , Lisboa, 1987, vol V, pag 329-339 in revista Palestra Chapman, Allan, Dividig the Circle, the development of critical mesurement in astronomy 1500-1850, Chicester, 1994

59. Ciência Em Portugal - Episódios Translate this page Depois de tentativas, feitas por outros, jesse ramsden (1731-1800), entre 1768 e1773, concebeu e desenvolveu a máquina de dividir escalas circulares (Fig 2 http://www.instituto-camoes.pt/cvc/ciencia/e20.html

Cultura Portuguesa Pedro Nunes, Mercator e Escher Pedro Nunes e a Astrologia Francisco Sanches - O Elo Perdido Os Nomes Portugueses de Al-Khuarizmi O Instrumento de Sombras O Picante dos Descobrimentos Galileu em Portugal O Fogo de Santelmo O Lume Vivo O Cometa do Vinho do Porto A Estrela de Cabral Vida breve O aluno de Madame Curie Entre o Porto e Recife O fabuloso Museu da Marinha Serendipidade PEDRO NUNES Bibliografia Arte de navegar , Lisboa, 1606 Maquina de dividir circular inventada por Jesse Ramsden. Desenho incluido na sua obra Description of an engine for dividing mathematical instruments, Londres, Froment Coimbra Regimento do Regimento Arte de Navegar , publicada em 1606, diz-nos:" Descrito o astrolábio resta dividi-lo, a qual divisão se fará desta maneira. Divide-se cada quadrante superior em 3 partes iguais, cada uma das quais se repartirá em outras 3, e serão 9 e destas cada uma pelo meio saírão 18 que divididas cada uma em 5 ficará o quadrante dividido em 90 e cada uma das quais e ao centro do círculo ajuntando uma regra [régua] se tirarão por elas linhas pequenas, lançando as que se tirarem de 10 em 10 graus, por ambos os intervalos e as de 5 em 5 que tiveram no papel, descrevendo os círculos com um compasso de pontas de aço e as linhas com uma ponta do mesmo, para que corte o latão divisando os graus com umas riscas pequenas, assim como em papel se usa fazer um em branco e outro em preto".

60. Die Entwicklung Des Meridiankreises 1700-1850 Translate this page Olaus Römer 2.2 Die Wiederentdeckung des Kreises für astronomische Meßinstrumentedurch Tobias Mayer 2.3 Die Kreisteilmaschinen von jesse ramsden 2.4 Die http://www.gnt-verlag.de/programm/21/inhalt.shtml

Inhaltsverzeichnis Klaus-Dieter Herbst Die Entwicklung des Meridiankreises 1700-1850 253 Seiten, 63 Abb., Pb., 35,80 Euro ISBN 3-928186-21-3 Rezensionen Einleitung des 18. bis zur Mitte des 19. Jahrhunderts Beginn des 18. bis zur Mitte des 19. Jahrhunderts des 18. bis zur Mitte des 19. Jahrhunderts 2.1 Der Meridiankreis von Olaus 2.2 Die Wiederentdeckung des Kreises Mayer 2.3 Die Kreisteilmaschinen von Jesse Ramsden Ramsden 2.4.1 Die Drehbank von Ramsden als Voraussetzung Ramsden und ihre technikhistorische durch Maudslay 2.5 Die Erfindung des achromatischen Fernrohrobjektives 2.6 Die Anwendung von Ablesemikroskopen 2.7 Bestrebungen zum Bau von Kreisinstrumenten nach und vor Ramsden des Baues von Kreisinstrumenten im 18. Jahrhundert 3.1 Das Erkennen der Notwendigkeit eines Kreisinstrumentes 3.1.1 Impulse von Herschel und Wollaston 3.1.2 Das Erkennen des Vollkreises als Alternative zum Quadranten Baues von Kreisinstrumenten im 18. Jahrhundert Ramsden Roy 3.2.2 Die astronomischen Kreisinstrumente von

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