Educational contact goniometer with fixed arms

 

S.L. Penfield, New Haven, Conn., U.S.A.
Contact goniometer (cardboard 15 x 7.7 cm) with fixed celluloid arms, with instruction leaflet (12 x 20.2 cm) in stiff paper envelope (16 x 8.7 cm).
Signed "CONTACT GONIOMETER | MODEL B. | Designed by | S.L. Penfield | Professor in Yale University | Made in New Haven, Conn., U.S.A. | Pat. July 31, 1900."

private collection

Educational contact goniometer with fixed arms, S.L. Penfield, New Haven, Conn., U.S.A.

Educational contact goniometer with fixed arms, S.L. Penfield, New Haven, Conn., U.S.A.

Educational contact goniometer with fixed arms, S.L. Penfield, New Haven, Conn., U.S.A.

Educational contact goniometer with fixed arms, S.L. Penfield, New Haven, Conn., U.S.A.
 
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