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Two Lockey
and Howland Split-Frame Mechanisms

In
the Heavy-Frame and Tilt-Frame the movable part of the frame
is a first-class lever.
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In
the split-frame (with low base) the movable part of the
frame is placed on the axle and can slide forward or backward.
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Back to Split-Frame
The
Heavy-Frame and Tilt-Frame both use the same mechanism for the
push-off. Traditionally, the Split-Frame on low base is placed
in-between the Heavy-Frame and the Tilt-Frame when discussing the evolution
of Lockey and Howland's Split-Frame designs. One wonders if the Split-Frame
on the low base should be first or maybe even last in the sequence
of this series? The Split-Frame on the low base in our museum seems
to have an original thumbscrew consistent with earlier designs, which
maybe evidence that this parer was first in the sequence.
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