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
-----------------------------------------------------------
This email message is intended only for the addressee(s)
and contains information that may be confidential
and/or copyright. If you are not the intended recipient
please notify the sender by reply email
and immediately delete this email.
Use, disclosure or reproduction of this email by anyone
other than the intended recipient(s) is strictly prohibited.
No representation is made that this email or any attachment
are free of viruses. Virus scanning is recommended and is the
responsibility of the recipient.
--
https://www.adelaide.edu.au/study/
---------------------------------------------------
https://lists.uni-koeln.de/mailman/listinfo/sundial
