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- Never-yielding Cement
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- Composition I Saltpetre Two Ounces Flour Of Sulphur One Ounce
- The Three Magical Parties
- Chemical Illuminations
- The Deforming Mirrors
- A Water Which Gives Silver A Gold Colour
- Bottles Broken By Air
- A Liquid That Shines In The Dark
- Of Gunpowder &c
- Invisible Ink
- Another
- A Lamp That Will Burn Twelve Months Without Replenishing
- A More Powerful Fulminating Powder
- Another Way
- Inflammable Phosphorus
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- The Leech A Prognosticator Of The Weather
- To Make Squibs And Serpents
- 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
- To Extract The Silver Out Of A Ring That Is Thick Gilded So That The
- 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
- To Tell How Many Cards A Person Takes Out Of A Pack And To Specify
- The Power Of Water When Reduced To Vapour By Heat



Account Of The Wonderful Effects Of Two Immense Burning-glasses








Mr. de Tschirnhausen constructed a burning-glass, between three and
four feet in diameter, and whose focus was rendered more powerful by a
second one. This glass melted tiles, slates, pumice-stone, &c., in a
moment; pitch, and all resins, were melted even under water; the ashes
of vegetables, wood, and other matters, were converted into glass;
indeed, it either melted, calcined, or dissipated into smoke, every
thing applied to its focus.

Mr. Parker, of Fleet-street, made a burning-glass, three feet in
diameter; it was formed of flint glass, and when on its frame, exposed
a surface of 2 feet 8-1/2 inches to the solar rays. It had a small
glass fitted to it, to converge the rays, and heighten the effect. The
experiments made by it were more powerful and accurate than those
performed by any other glass. The following is a brief epitome of its
astonishing power.

--------------------------------------+-------+-------+
Substances melted, with their weight; Weight Time
and the Time in Seconds, which in in
they took in melting. Grains.Seconds
--------------------------------------+-------+-------+
Pure gold 20 4
---- silver 20 3
---- copper 33 20
---- platina 10 3
Nickel 16 3
A cube of bar-iron 10 12
--------- cast-iron 10 3
--------- steel 10 12
Scoria of wrought-iron 12 2
Kearsh 10 3
Cauk, or terra ponderosa 10 7
A topaz, or chrysolite 3 45
An oriental emerald 2 25
Crystal pebble 7 6
White agate 10 30
Oriental flint 10 30
Rough cornelian 10 75
Jasper 10 25
Onyx 10 20
Garnet 10 17
White rhomboidal spar 10 60
Zeolites 10 23
Rotten-stone 10 80
Common slate 10 2
Asbestos 10 10
Common lime-stone 10 55
Pumice-stone 10 24
Lava 10 7
Volcanic clay 10 60
Cornish moor-stone 10 60
--------------------------------------+-------+-------+





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