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1659689969Code 670 Telescope dDopterTelescope diopter for praetorian tablet signed Secretan Paris n. 3733 from the early 1900s.
Praetorian Tablet: the name derives from Pretorius, a professor in Altdorf, who conceived it in 1590. Used to trace medium and small scale maps, as it allows you to draw in detail and with contour lines in view of the terrain.
Missing from the line.
cm 20,5x10x16 – inches 8.15x4x5.9
Secretan was a manufacturer of scientific instruments founded in Paris in 1845 by the Swiss mathematician Marc Secretan (1804-1867).
Topography studies instruments, surveying techniques, calculus and plans to represent graphically in scale a part of the Earth surface on a map, indicating its details like streets, rivers, buildings, cultivations… Topography is one of the most antique science. Egyptians measured lands along the Nile for tracing borders after periodic overflows of the river. Greeks and Romans used some topographical method very precise; some topographers teams (“gromatici”) following Roman legions traced borders and divided conquered lands in regular plots, then described and represented on copper plates. Arabs used topography to realize maps and to measure agrarian surfaces and lands for cadastral use.
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Antique measuring instruments
Code 670 Telescope dDopter
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