The Trippensee Planetarium is a demonstration model of the movement of the earth, moon and Venus relative to each other and to the sun. It shows such phenomena as the succession of seasons, and solar and lunar eclipses.In addition to its educational objective, the tellurian is also decorative and entertaining. The original models, patented in 1908, have maple arms and central standards. Those produced around the second quarter of the 20th century have ebonized arms and central standards. Models made after World War II models are of Bakelite or plastic.
Raised oval legend on arm: TRIPPENSEE/ PLANETARIUM CO./ SAGINAW, MICH.
Rectangular metallic label on arm: TRADEMARK/ REGISTERED/ TRIPPENSEE/ PLANETARIUM
Round Cartouche on Globe: Trippensee/ Planetarium Co./ Saginaw, W.S./ Mich.
Legend under Cartouche: © The George F. Cram Co., Inc./ Indianapolis 7, Ind.
Condition: Globe, moon, Venus ball, sun, planetarium overall all generally very good or better with the usual light wear, handling, toning. Plastic parts — possibly Bakelite or a related dense hard plastic — intact. Mechanism in working order.
Hovey, Edward Hovey. Elements of Mathematical Geography – A Hand Book for School and Home Use in Connection with the Trippensee Planetarium (Detroit: 1911).