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Nicomedes's Mechanism for Constructing a Conchoid

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Set the mechanism, then move!
distance OB
length |AP|
move
show labels
This Demonstration gives Nicomedes's (c. 180 BC) mechanism for constructing a conchoid. The mechanism consists of three rulers. Two are perpendicular; the horizontal one has a slot
s
and the vertical one has a fixed peg at
O
. The third ruler,
PAO
, has a fixed peg at
A
that slides along
s
and a slot that lets it slide along
O
.
You can vary the distance between the points
O
and B and the length
AP
.
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