CARENGEOT-TYPE SIMPLE CONTACT GONIOMETER by F. PELLIN
07-002. French, 2nd half 19th century, signed in script in the back "F. Pellin, Paris" and numbered 21.
Made of nickel plated brass, 4 3/4" long overall, with 2 1/8" radius arc graduated 0 - 180 degrees.
The 4 3/8" long slotted arms are held together with a knurled brass screw clamp assembly that fits
over a small pin in the center of the protractor base. This attractive small contact goniometer is
in very good overall condition. See Ulrich Burchard's article 'History of the Development of the
Crystallographic Goniometer" in "The Mineralogical Record," Volume 29, Number 6 (November-December
1998) for a thorough discussion of goniometers and their makers, including simple contact
goniometers.
