in the Clerk’s Office of the District Court of the United States,
for the Eastern District of Pennsylvania.
[Illustration: PLATE I.]
[PLATE I.
_Engraving and description of the apparatus, which, being contrived
for the purpose of determining whether the manifestations attributed
to spirits could be made without mortal aid, by deciding the question
affirmatively, led to the author’s conversion._
(_a_) PLATE I. FIG. 1, is an engraving from a photograph of the
apparatus above alluded to. The disk _A_ is represented as supported
upon a rod of iron forming the axis on which it turns. To the outer
end of this rod, the index _B_ is affixed, so as to be stationary in
a vertical position; the upper termination situated just in front of
the letters. These are placed around the margin of the disk. The cord
_C_ encircles the pulley situated about the centre of the disk, like
a hub to a carriage wheel. The ends of the cord are severally tied to
weights, which, when the table is tilted, react against each other
through the pulley; one being so large as to be immovable, the other so
small as to be lifted. Of course a hook in the floor may be substituted
for the larger weight.