Geometrical instruments – Scriber – Curved line
Patent
1979-03-05
1980-04-29
Haroian, Harry N.
Geometrical instruments
Scriber
Curved line
B43L 1100
Patent
active
041998685
ABSTRACT:
An amusement device including a base and a support carried by the base for suspending a pendulum above a marking surface. The pendulum includes a marker for tracing figures on the marking surface which is provided by a granular material contained in a bowl carried by the base. As the pendulum swings to and fro, the bowl can be rotated to control the tracing of geometrical figures on the marking surface.
REFERENCES:
patent: 850552 (1907-04-01), Werner
patent: 1754094 (1930-04-01), Glass
patent: 2215462 (1940-09-01), Davidson et al.
patent: 3516193 (1970-06-01), Engelman
patent: 3590488 (1971-07-01), Padowicz
patent: 4067111 (1978-01-01), Truitt
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