1767-1848.
Thackara was eight months old when he and his parents came to Philadelphia from England. He apprenticed with Robert Scott and James Trenchard as an engraver from 1786 to 1789. In 1790 he married James Trenchard's sister Hannah. Thackara was curator for the Pennsylvania Academy of Fine Arts from 1816 to 1828, and he is listed as an engraver in the Philadelphia City Directories from 1791 to 1833. His partnership with John Vallance is listed in the 1794 City Directory. He and his son William formed the firm of Thackara and Son in 1832. Thackara was elected Commissioner of the District of Southwark Philadelphia in 1797, and served as clerk of the Pennsylvania House of Representatives from 1807 to 1810.
Washington Map Society.
Död 1696.
Holländsk matematiker. För firman van Keulen (se denne) utarbetade han under 1690-talet ett sjökartverk. 'De nieuwe groote lichtende Zee-Fakkel' som senare kom i flera upplagor. På titelbladet kallar han sig 'Geometra en Leermester der Wiskunst'.
Bland arbeten.
De nieuwe groote lichtende Zee-Fakkel.
Phillips.
Ca. 1547-99.
Tysk kartograf son till Gerard Mercator (se denne). Född i Leuven, död i Duisburg. Han började som bokhandlarlärling hos förläggaren Arnold Birckman i Köln och arbetade sedan under flera år vid dennes filialer i London och Antwerpen. Men så kastade han sig över geografiska studier och blev sin fars medhjälpare. Världskartan 1587 är det första kända arbetet från hans hand. Senare följde en Europakarta och 1590 en Tysklandskarta. Efter faderns död ansvarade han för utgivningen av dennes atlas.
Averdunk.
Karta öfver Stockholm. - 1904.
Boisman - C. H. Tersmeden ca 1900.
Frisius, Gemma. [Reinerszoon, Jemme.]
Biografiska uppgifter:9 december 1508 - 25 maj 1555.
Gemma Frisius was a physician, mathematician, cartographer, philosopher, and instrument maker. He created important globes, improved the mathematical instruments of his day and applied mathematics in new ways to surveying and navigation.
Frisius was born in Dokkum, Friesland (present-day Netherlands) of poor parents, who died when he was young. He moved to Groningen and studied at the University in Leuven beginning in 1525. He received the degree of MD in 1536 and remained on the faculty of medicine in Leuven for the rest of his life. His oldest son, Cornelius Gemma, edited a posthumous volume of his work and continued to work with Ptolemaic astrological models.
While still a student, Frisius set up a workshop to produce globes and mathematical instruments. He became noted for the quality and accuracy of his instruments, which were praised by Tycho Brahe, among others. In 1533, he described for the first time the method of triangulation still used today in surveying. Twenty years later, he was the first to describe how an accurate clock could be used to determine longitude. Jean-Baptiste Morin (1583–1656) did not believe that Frisius' method for calculating longitude would work, remarking, 'I do not know if the Devil will succeed in making a longitude timekeeper but it is folly for man to try.'
Frisius created or improved many instruments, including the cross-staff, the astrolabe and the astronomical rings. His students included Gerardus Mercator (who became his collaborator), Johannes Stadius, John Dee, Andreas Vesalius and Rembert Dodoens.
A lunar crater has been named after him.
Bland arbeten:
(Cosmographia (1529) von Petrus Apianus, annotated by Gemma Frisius)
De principiis astronomiae et cosmographiae (1530)
De usu globi (1530)
Libellus de locorum describendorum ratione (1533)
Arithmeticae practicae methodus facilis (1540)
De annuli astronomici usu (1540)
De radio astronomico et geometrico (1545)
De astrolabio catholico (1556)
