USD227573S - Pendulum demonstration device - Google Patents

Description

Des. 227,573 Patented July 3, 1973 United States Patent 0 Ice 227,573 v PENDULUM DEMONSTRATION DEVICE Roger D. Stephenson, Overland Park, Kans., assignor to Physics Apparatus Research, Inc., Overland Park, Kans.

Filed July 19, 1971, Ser. No. 164,202

Term of patent 14 years Int. Cl. D19-07 US. Cl. D251 R FIG. 1 is a front elevational view of a pendulum demonstration device showing my new design;

FIG. 2 is a right side elevational view of the invention shown in FIG. 1;

FIG. 3 is a top plan view of the invention shown in FIG. 1;

FIG. 4 is a rear elevational view of the invention shown in FIG. 1;

FIG. 5 is a right side elevational view of the invention shown in FIG. 4; and

FIG. 6 is a bottom elevational view of the invention shown in FIG. 4.

PAGE 2 I claim: The ornamental design for a pendulum demonstration device, as shown and described.

References Cited Welch Laboratory Apparatus, recd Oct. 25, 1965, p. 89, upper right, item No. 0833, Sand Pendulum.

Leybold Physics Apparatus, recd July 19, 1966, p. 41, middle left, item 37330.

MELVIN B. FEIFER, Primary Examiner

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