Julien Peridier Equipment
12.3" Calver; Twin 8" F13 Refractors on Cooke Mount; Troughton & Sims Transit
A little history: Julien Peridier had an
observatory in Le Houga, Gers, France. He had a 12.3" George Calver on a #2
Observatory mount; a Cooke mount which he had M. Manent modify to hold two 8"
F13 refractors (with optics by André Joseph Alexandre Couder); a Troughton &
Sims transit telescope; a massive library; and many other things.
I do have some of the correspondence from Broadhurst &
Clarkson when Peridier bought the Calver.
The Calver has quite a history: George Calver made it 1889. It
is a 12.3" F6.6 Newtonian on a
No. 2 pedestal observatory equatorial mount It went to an unknown
person, then Broadhurst & Clarkson sold it to Peridier in 1931. While at the
observatory, it was used by Gerard de Vaucouleurs, and others. Donald Howard
Menzel chose the Le Houga Observatory as one of the sites from which Harvard
College Observatory successfully observed the occultation of Regulus by Venus in
July 1959. Le Houga Observatory was the site of a five-year NASA program,
conducted jointly with Harvard from 1961 to 1965, with multi-color photoelectric
photometry of the Moon and planets with the Calver reflector. The book "Harlan's
Globetrotters" is the story of astronomers that took the Calver to the Sahara
Desert to view the 1973 Eclipse. Parts of the scope and mount were modified for
the expedition.
The Calver had a 16.75" Byers worm drive installed on it for
the trip to the Sahara Desert. I have the original worm gear and drive, but it
appears part of the mount was machined to accommodate the new Byers worm wheel.
The Calver tube has had several focusers installed on it, as well as many
different instruments, because there are lots of holes in the tube. I did not
realize this was a rotating tube until I took it apart for restoration. Where
the tube rings attach to the base - both sides were cracked and I have no idea
what kept the tube from falling off. The mirror has several places where whoever
resilvered it signed it.
For the Troughton & Sims transit, I made the 3 brass leveling
bolts. The lens was missing - I acquired some material from the estate of the
late Al Woods, and one of the lenses in a box was exactly a fit physically, and
also exactly the correct focal length. The lens cell was badly bent, so I made a
new one. I also repaired the focuser and installed new webs.
12.3" F6.6 George Calver, mostly completed. For more pictures go to this page.
Twin 8" F13 refractors on Cooke mount. I call it the Cooke/Manent/Couder. For more pictures, including restoration, go to this page.
Filar Micrometer for Cooke/Manent/Couder The tube replaces the focuser on the faceplate and is 82MM diameter.
Troughton & Sims Transit. It was also part of Peridier's equipment. For more pictures, go to this page.