Tag Archives: Isobaths

Lewis (contours and bench marks)

In every sense, the next journey is into unknown territory. I feel confident discussing early uses of isobaths, even the life and times of Charles Hutton, but after him, the story of contours emergence onto maps takes place variously in: … Continue reading

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Chain of Custody

The earliest map visited on my travels is of a navigation channel for the Spaarne by Pieter Bruins, Bruinsz or Bruinszoon in 1584. The dotted line marked ‘7 voet’ probably denotes water ‘deeper than’ and as such I consider it … Continue reading

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Altitude

A moment of idle curiosity led to downloading a phone app for altitudes. It uses two systems: GPS and ASTER (a digital elevation model) and now, as I write, note I am sitting at either 402 or 396 feet above … Continue reading

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What does water look like?

I’ve chosen the right-hand side of the train for potential glimpses of the Merwede River, Gorinchem is the end station but they seem never to mention it. There are regular announcements for ‘Horkem’ though, which I can’t find on the … Continue reading

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Floods

Early morning radio: a man is watching water climbing the stairs. It’s not the first time he’s been flooded out and it will happen again as arguments for dredging and speeding flow versus slowing the onrush – via water meadow … Continue reading

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Making Connections: a line through history

Our Italian Marsigli has important friends; on Isaac Newton’s recommendation he had been elected a member of the Royal Society in 1691. In the 1720’s he visits London then travels on to the Netherlands where at Leiden he also met … Continue reading

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The Other Italian & the First Printed Isobath Map

Luigi Ferdinando Marsigli is a name that kept cropping up reading around cartography. I kept sidelining him as biographers seemed to place his interests mostly elsewhere. Born in 1658 to a wealthy and noble family, he studied – among other … Continue reading

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