Elliptical
trammel-
Since Elliptical
trammel consist of two turning pairs and two sliding pairs, it is inversion of
double slider crank chain.This instrument is used for drawing ellipses. This
inversion is obtained by fixing a slotted plate (link 4) as shown in fig. It
has got two right angled grooves cut into it.
1-2 is
turning pair
2-3 is turning pair
1-4 is sliding pair
3-4 is sliding
pair
As the crank BC is
rotated, any point on crank except midpoint of BC and point B and C will trace
the ellipse. Midpoint of BC will trace a circle. The points B and C will move
in straight line along the slot.
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