Dear Francesco,
Grazie mille!
Peter
On 20/04/2022 23:10:26, Francesco Caviglia wrote:
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Attached the two figures
Regards
Francesco Caviglia
Hi,
In Gian Casalengo's recent alert to the contents of the current number of /Orologi Solari/, one of the
articles is: 5. - "A hat for the sun (A visual tour of Europe hatsundials)" by Manuel
Pizarro. I was fascinated and a bit of searching took me to Alexandre Vial's /Théorie du cadran à
chapeau/ (Theory of the Hat Sundial) from 2009. Vial mentions that an early account was given by
Jacques Ozanam in his /Récréations mathématiques/. Problem 28 is to "Describe a Dial on the convex
surface of a cylinder perpendicular to the horizon, & motionless" (/décrire un cadran sur la
surface convexe d'un cylindre perpendiculaire à l'horizon, et immobile/). Problem 28 turns out to be in
the second (1778) edition of the Récréations. I was able to find a scanned copy of that edition done by
Google. But when it was being scanned, the plates/ planches crucial to following Ozanam's description
were not unfolded and so Figures 27 and 28 are not visible.
Hence this message: is anyone on the List able to find and/or scan these
missing plates and figures?
Many thanks,
Peter
-- -----------
Peter Mayer
Department of Politics & International Relations (POLIR)
School of Social Sciences
http://www.arts.adelaide.edu.au/polis/
The University of Adelaide, AUSTRALIA 5005
Ph : +61 8 8313 5609
Fax : +61 8 8313 3443
e-mail:[email protected]
CRICOS Provider Number 00123M
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Francesco CAVIGLIA
via SAFFI 21
10138 Torino
tel. 011 4333703
mob. 3356121207
[email protected]
--
-----------
Peter Mayer
Department of Politics & International Relations (POLIR)
School of Social Sciences
http://www.arts.adelaide.edu.au/polis/
The University of Adelaide, AUSTRALIA 5005
Ph : +61 8 8313 5609
Fax : +61 8 8313 3443
e-mail:[email protected]
CRICOS Provider Number 00123M
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