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Weird Machines

Mechanical lifting jack for use on wagons and carriages:

pic1098.jpg

The rack-plate on the right is the fulcrum,
while the one on the left serves as a catch:

pic1098a.jpg

From the patent:
"...principally intended to be used for elevating and supporting either end of the axles of various kinds of vehicles prepatory to removing the wheels therefrom for the purpose of applying some lubricating material to the journals of said axles."