RAMSDEN EYEPIECE (Search FastHealth.com) RAMSDEN EYEPIECE used esp. in instruments fitted with micrometer wires or a scale ramsden,jesse (17351800), British instrument maker. ramsden was http://www.fasthealth.com/dictionary/r/Ramsden_eyepiece.php
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
RAMSAY, SIR WILLIAM MITCHELL ramsden, jesse (1,7351800), English astronomical instrument maker, was bornat Salterhebble near Halifax, Yorkshire, on the 6th of October 1735. http://34.1911encyclopedia.org/R/RA/RAMSAY_SIR_WILLIAM_MITCHELL.htm
Extractions: author of Everyday Life in Turkey (1897) and The Romance of Elisavet (1899). According to a 12th-century chronicle of one of the monks, the name Ramsey is derived from the words ram, referring to the tradition of a solitary ram having taken up its abode here, and ey meaning an island. Ramsey, however, was not completely insulated, like some of the monasteries of, the Fen district. The abbey was founded by Ailwin, earl of the East Angles, in 969, and a charter of King Edgar granted lands and privileges for the purpose. Ramsey Abbey was noted for the school established within its walls, and for its library of Hebrew works. Its abbot was mitred. The lands were granted after the dissolution to Sir Richard Cromwell. RAMSEY, a seaport and watering-place on the north-east coast of the Isle of Man, 15 m. N.N.E. of Douglas. Pop. (1901) 4729. It lies on the wide Ramsey Bay, at the mouth of the Sulby river, the estuary of which forms a small harbour. To the north and west the country is flat, but to the south the lower slopes of the North Ballure hill rise sharply. A creek of the Sulby river on the north side of the town is formed into a picturesque lake. The Queens pier permits of the landing of passengers at all times, and Ramsey is served by
Foscarini Fisica: Macchina Elettrica Di Ramsden Translate this page Il culmine dei vari perfezionamenti compiuti sulle macchine elettrostatiche è rappresentatodal modello inventato verso il 1770 da jesse ramsden (1735 - 1800 http://www.liceofoscarini.it/fisica94/ramsden.html
Extractions: ScriviLogo('') Elettromagnetismo elettrostatica Questa pagina richiede Javascript Per studiare i fenomeni legati all'elettrostatica uno scienziato doveva possedere per prima cosa uno strumento in grado di operare una sufficiente separazione tra le cariche elettriche sulla superficie dei conduttori e di trasferire o strappare da essi le cariche elettriche, ovvero gli elettroni. Il fisico e borgomastro di Magdeburgo Otto von Guericke (1602 1686), conosciuto soprattutto per i suoi spettacolari esperimenti pubblici sulla pressione atmosferica (Emisferi di Magdeburgo) , costruì la prima macchina per produrre elettricità. Il culmine dei vari perfezionamenti compiuti sulle macchine elettrostatiche 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
Foscarini Physics Lab: Ramsden Electic Machine were gradually improved and the most efficient electric machine at the end of theXVIII century was the one invented around 1770 by jesse ramsden (1735 1800 http://www.liceofoscarini.it/fisica94/english/ukramsden.html
Extractions: For the Italian version of this page click here For studying the electrostatic phenomena a scientist had to own a tool able to make a sufficient separation between the electric charges on the surface of the conductors. The physique and burgomaster of Magdeburg Otto von Guericke (1602 - 1686), known for his spectacular public experiments on the atmospheric pressure ( Magdeburg hemispheres ), was the first to build an electric machine. This tools were gradually improved and the most efficient electric machine at the end of the XVIII century was the one invented around 1770 by Jesse Ramsden (1735 - 1800). This type of machine was widely used for about a century. ScriviCoda ('../', 3, 3)
PSIGate - Physical Sciences Information Gateway Search Results Home Search results Full record jesse ramsden. ramsden specialised inthe design and development of physical and astronomical instrumentation. http://www.psigate.ac.uk/roads/cgi-bin/tempbyhand.pl?query=1034157493-20143
PSIGate - Physical Sciences Information Gateway Search Results jesse ramsden. ramsden specialised in the design and development ofphysical and astronomical instrumentation. This resource describes http://www.psigate.ac.uk/ROADS/subject-listing/policy/520.09.html
The Great Theodolite built. In 1775 jesse ramsden, (17351800) a most innovative Londoninstrument maker, completed his circular dividing engine. This http://www.surveyhistory.org/the_great_theodolite.htm
The Dividing Engine In 1773, jesse ramsden of England invented the circular dividing engine,an instrument which had a profound impact on Western history. http://www.surveyhistory.org/the_dividing_engine.htm
Extractions: The following article by Anthony A. Leiserowitz is taken from the Museum of Surveying Newsletter The Dividing Engine in History Click on thumbnail photo below: Circular Dividing Engine that made surveying and scientific instruments sold by the Berger Company. This wonderful machine is on exhibit at the Museum of Surveying in Lansing, Michigan In 1773, Jesse Ramsden of England invented the circular dividing engine, an instrument which had a profound impact on Western history. Prior to his invention, the division and inscription of scales on mathematical instruments was done by hand. Therefore, the value of the instrument depended on the accuracy of the maker and his tools. Instruments such as surveying compasses were subject to wide variations in quality, as each instrument required a maker with an extraordinary control of tools and a very precise eye. Instruments were produced one at a time, which limited the number available for purchase and making them prohibitively expensive. Ramsden's invention of the mechanical dividing engine, however, eliminated human error and increased the production of precise scientific and mathematical instruments. This was particularly important for the development of the octant and the sextant, both vital to the British Navy. These instruments made the exploration of the world's oceans and the establishment of the British Empire possible. An octant or sextant enabled a sea captain to determine longitude, which, when mapped against latitude, provided his precise location anywhere on Earth. Ramsden shared in the national prize given to solve the longitude measurement problem.
History Of Astronomy: Persons (R) Short biography (Eric Weisstein's Treasure Trove). ramsden, jesse(17351800) Short biography and references (MacTutor Hist. Math http://www.astro.uni-bonn.de/~pbrosche/persons/pers_r.html
Extractions: Ragona, Domenico (1820-1892) Rajewsky, Boris (1893-1974) Raman, Chandrasekhra Venkata (1888-1970) Ramsay, William (1852-1916) Ramsden, Jesse (1735-1800) Ramus, Peter (1515-1572) Rankine, William John Macquorn (1820-1872) Raphson, Joseph (1648-1715) Rasch, Johann (ca.1540-1615) Rayleigh, Lord: see Strutt, John William (1842-1919) Razi: see al-Razi, Mohammad Ibn Zakariya (864-930)
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
Extractions: 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
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
Extractions: search visiting exhibitions online let's talk ... technology in everyday life Source: Ordnance Survey Ramsdens 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
Ramsden Okulár jesse ramsden alakította ki az okulárok ezen típusát 1782ben.Szintén két síkdomború lencsét tartalmaz, de itt a két http://macsbk.csillagaszat.hu/tavcso/okularok/ramsden.html
Extractions: Jesse Ramsden alakította ki az okulárok ezen típusát 1782-ben. Szintén két síkdomború lencsét tartalmaz, de itt a két lencse fókusztávolsága egyenlõ, domború felükkel az okulár belseje felé néznek, és közelebb is ülnek egymáshoz, mint a Hygens típusú okulárok lencséi. Ez az elrendezés kedvez a szemtávolságnak (nagyobb, mint a Hygens esetén), de az optikai hibák ezen típusnál is kifejezettek. Akárcsak elõdje, a Ramsden típus is a kihaló félben lévõ okulárokhoz tartozik.
Trades Directories John 1. Towlerton, George 1. Wilson, George Joiners 1. Binks, Henry Shopkeepers1. Bedford, George 1. Gill, John 1. Harpin, George 3. ramsden, jesse. http://www.ejgreen.freeserve.co.uk/td.htm
Extractions: Entries covering Wrenthorpe and Silcoates in Local Trades Directories from 1853-1936 CONTENTS (click on the section you want) The local historian can derive valuable information from trades directories. These were the nineteenth century equivalent to the Yellow Pages, but gave more information than just lists of local companies. Each town and village has its own entry, which usually contains three types of information. Firstly there is a paragraph of general information about the area, a brief history, information about the local churches and schools along with details of the postal service. Next is a list of residents, which is followed by the main list of trades people in alphabetical order. Entries for Wrenthorpe from four old trades directories are printed below. It has to be remembered that as interesting as the entries are, they only provide us with limited information. Only the wealthiest residents are recorded and of these only the head of the household is listed. Some of the information may have been out of date at the time the directory was printed. The other most frustrating problem with village entries such as Wrenthorpe's, is the vagueness of the details. No precise address is given, there are no street numbers as there would be for businesses in towns and cities. At least we are given some indication due to ancient township boundary along the course of Foster Ford Beck and Balne Beck. Entries headed Silcoates therefore relate to Silcoates Lane, Wrenthorpe Lane (usually referred to as Sunny Hill) and Jerry Clay Lane which were in the old Alverthorpe-cum-Thornes township. Wrenthorpe entries are usually divided into Bragg Lane End, Potovens (meaning the present village centre to the East of the beck boundary) and Snow Hill (referring to the then isolated hamlet of properties near the Bay Horse PH).
Ramsden Translate this page jesse ramsden (1735-1800) gründete 1762 in London eine Werkstatt füroptische Instrumente. Sein Hauptgeschäft lag in der Anfertigung http://www.achromat.de/html/tele/tele_ramsden.html
Latitude Longitude 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.ucv.mct.pt/latlong/anterior/nonio1.asp
Extractions: A navegação astronómica teve início ainda no século XV, quando os navegadores portugueses, ao afastarem-se da costa tiveram de recorrer a instrumentos de altura para determinar a posição do navio. Para o efeito, usaram quadrantes e astrolábios náuticos que, necessariamente tinham de estar bem divididos pois, só assim, se assegurava o rigor dos cálculos que efectuavam. Esta exigência era tal que, no século seguinte, o Regimento do Cosmógrafo-mór, promulgado em 1592, estabelecia a obrigatoriedade de exame dos mestres das cartas de marear e fabricantes de instrumentos náuticos, assim como a verificação pelo Cosmógrafo-mór, que neles devia apôr a sua assinatura como atestado de qualidade. O Regimento ia ao ponto de aplicar penas aos fabricantes não examinados e aos mestres aprovados que não submetessem as suas obras a exame.
Latitude Longitude of an engine for dividing mathematical instruments, Londres, 1787 Reis,A Translate this page Sciences and Literature, by Abraham Rees, Londres, 1819 ramsden, jesse, http://www.ucv.mct.pt/latlong/anterior/nonio6.asp
Extractions: This circular protractor was made by Jesse Ramsden, one of the best precision instrument makers of the second half of the XVIIIth century and designer of the first dividing machine that could work the limbs of small diameter circles with great accuracy. The whole circumference of the protractor is divided into degrees and the vernier is divided into 20 parts.
Museo Della Specola, Bologna - Catalogo, Strumenti Vari, 85 Translate this page jesse ramsden (Halifax 1735 - Brightelmstone 1800) ottone diametro20,2 cm, lunghezza barra 16,3 cm Inv. MdS-72 Si tratta di un http://www.bo.astro.it/dip/Museum/italiano/mat_85.html
Extractions: Si tratta di un goniometro circolare realizzato da Jesse Ramsden, uno dei migliori costruttori di strumenti di alta precisione della seconda metà del Settecento, realizzatore, tra l'altro, della prima macchina per dividere, in grado di lavorare con alta precisione lembi di cerchi di piccolo diametro. E' diviso in gradi per tutta la circonferenza e il nonio è diviso in 20 parti. M. Daumas (1953), pp. 264, 318.
