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- Never-yielding Cement
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- The Three Magical Parties
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- A Water Which Gives Silver A Gold Colour
- Bottles Broken By Air
- Of Gunpowder &c
- A Liquid That Shines In The Dark
- Invisible Ink
- Another
- A Lamp That Will Burn Twelve Months Without Replenishing
- A More Powerful Fulminating Powder
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- Inflammable Phosphorus
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- To Make Squibs And Serpents
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- To Give Silver-plate A Lustre
- To Show The Spots In The Sun's Disk By Its Image In The Camera
- To Load Air Balloons With Stars Serpents &c &c When You Fill
- To Find The Number Of Changes That May Be Rung On Twelve Bells
- To Tell The Number Of Points On Three Cards Placed Under Three
- To Find The Difference Between Two Numbers The Greatest Of Which Is
- To Represent Cascades Of Fire
- To Make Any Number Divisible By Nine By Adding A Figure To It
- To Fill A Bladder With Hydrogen Gas
- To Make Several Rockets Rise Together Take Six Or Any Number Of
- To Melt Iron In A Moment And Make It Run Into Drops
- The Power Of Water When Reduced To Vapour By Heat
- To Tell How Many Cards A Person Takes Out Of A Pack And To Specify
- To So Fill A Glass With Water That It Cannot Be Removed Without
- There Must Also Be A Glass Planned To Rise Up And Down In The Groove A B And So Managed By A Cord And Pulley C D E F That It May

The Magical Mirrors

Make two holes in the wainscot of a room, each a foot high and ten
inches wide, and about a foot distant from each other. Let these
apertures be about the height of a man's head, and in each of them
place a transparent glass in a frame, like a common mirror.

Behind the partition, and directly facing each aperture, place two
mirrors enclosed in the wainscot, in an angle of forty-five
degrees.[B] These mirrors are each to be eighteen inches square: and
all the space between them must be enclosed with pasteboard painted
black, and well closed, that no light can enter; let there be also two
curtains to cover them, which you may draw aside at pleasure.

When a person looks into one of these fictitious mirrors, instead of
seeing his own face he will see the object that is in front of the
other; thus, if two persons stand at the same time before these
mirrors, instead of each seeing himself; they will reciprocally see
each other.

There should be a sconce with a lighted candle, placed on each side of
the two glasses in the wainscot, to enlighten the faces of the persons
who look in them, or the experiment will not have so remarkable an

[B] That is, half-way between a line drawn perpendicularly to
the ground and its surface.

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