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Because they sold in such huge numbers, the most frequently encountered models today are the "10F", a power-cross feed version of the "10-D", and the useful little backgeared and screwcutting 6-inch (3-inch centre height).
However, the very early 9-inch and the later more thoroughly developed 12-inch are not uncommon.
This municipal-sponsored tourism wasn’t just a pungent curiosity — the city really wanted to show off its subterranean half.
Baron Haussmann, the city planner so influential with the broad boulevards we know Paris for today, worked with engineer Eugène Belgrand in the 1850s to modernize the formerly haphazard array of tunnels into something that would accommodate the city’s booming population.
The museum is accessed through a rather unassuming stairwell at the Quai d’Orsay, something which almost vanishes into the waterfront not far from the Eiffel Tower and the Jean Nouvel-designed Musée du Quai Branly with its pristine gardens by the Seine.
Amazingly, some of these ancient scientific instruments have been preserved through the millennia, and can be visited today.Geologists call them concretions and and megaspherulites.A number of papers have been written on how they allegedly “grow” over Millions of years to become spheres.But the natives tell a different story: That they were already there when they arrived!In case you hadn't realised, this blog is finished (awwww).
Each provides a window into how our ancestors made sense of the world around them.