Contact goniometer with separate limbs
S.L. Penfield, New Haven, Conn., U.S.A.
Contact goniometer (cardboard 15 x 7.7 cm and separate
celluloid limbs) with instruction leaflet in stiff paper
envelope (16 x 8.7 cm).
Signed "CONTACT GONIOMETER | MODEL A. | Designed
by S.L. Penfield." and "Patented | July 31st,
1900. | Made in New Haven, Conn., U.S.A."
Samuel Lewis Penfield died in 1906 at the age of 50. The
instruction leaflet mentions "Late Professor in Yale
University" which dates the set after 1906.