Kart- och planschhandlare i Amsterdam. Son till Gerard Valck (se denne).
Frisius, Gemma. [Reinerszoon, Jemme.]
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...
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)
Engelsk bokhandel- och förlagsfirma grundlagd i London 1724 av Thomas Longman (se denne). Bland förlagets författare under den första tiden finner vi David Hume - en senare innehavare av Thomas Norton Longman (1771-1842). Under hans tid möter vi Walter Scott, Thomas Moore m.fl. Förlagets produktion spände även över kartor, men de verkar ha varit i mer begränsad skala. Under årens lopp har firman övertagit flera andra förlag. Under firmanamnet Longmans, Green & Co. driver det idag en världsomspännande verksamhet med filialer över hela det brittiska imperiet.
Dict. nat. biogr.
Gulddistriktet Klondike - ca 1897.
'A General Draught of the Gulf of Bothnia and Part of the Gulf of Finland.' - John Norris 1728.
