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Endless Amusement: A Collection of Nearly 400 Entertaining Experiments in Various Branches of Science; Including Acoustics, Electricity, Magnetism, Arithmetic, Hydraulics, Mechanics, Chemistry, Hydrostatics, Optics; Wonders of the Air-Pump; All the Popular Tricks and Changes of the Cards, &c., &c. to Which is Added, a Complete System of Pyrotechny; Or, the Art of Making Fire-works. — John Shaqi

Science

Endless Amusement: A Collection of Nearly 400 Entertaining Experiments in Various Branches of Science; Including Acoustics, Electricity, Magnetism, Arithmetic, Hydraulics, Mechanics, Chemistry, Hydrostatics, Optics; Wonders of the Air-Pump; All the Popular Tricks and Changes of the Cards, &c., &c. to Which is Added, a Complete System of Pyrotechny; Or, the Art of Making Fire-works.

Name: Endless Amusement: A Collection of Nearly 400 Entertaining Experiments in Various Branches of Science; Including Acoustics, Electricity, Magnetism, Arithmetic, Hydraulics, Mechanics, Chemistry, Hydrostatics, Optics; Wonders of the Air-Pump; All the Popular Tricks and Changes of the Cards, &c., &c. to Which is Added, a Complete System of Pyrotechny; Or, the Art of Making Fire-works.
Author: Unknown

Unknown

Card tricks; Fireworks; Magic tricks; Science -- Experiments; Scientific recreations

The hour the hand is placed at is                                8
  The next hour to that which A intends to rise at is 5, which
    counts for                                                     1
  Count back the hours from 5, and reckon them at 1 each, there
    will be 11 hours, viz., 4, 3, 2, 1, 12, 11, 10, 9, 8, 7, 6    11
                                                                 ----
                                                   Making         20


_A person having an even Number of Shillings in one Hand, and an odd
Number in the other, to tell in which hand the odd or even Number is._

You desire the person to multiply the number in his right hand by an
odd figure, and the number in his left by an even one; and tell you if
the products, added together, be odd or even. If even, the even number
is in the right hand; if odd, the even number is in the left. For
instance,

  I. Number in the right           In the left hand _odd_    7
          hand is _even_  18       Multiply by               2
     Multiply by           3                               ----
                         ----                      Product  14
                 Product  54                               ----
     Add the Product of
          the left hand   14
                         ----
     Which produces a
          total of        68


  II. Number in the right          In the left hand _even_  18
          hand is _odd_    7          Multiply by            2
     Multiply by           3                               ----
                         ----                      Product  36
                 Product  21
     Add the Product of
          the left hand   36
                         ----
     Which produces a
          total of        57


_Secret Correspondence._

[Illustration: Fig. 1.]

To carry on a correspondence without the possibility of the meaning of
the letter being detected, in case it should be opened by any other
person, has employed the ingenuity of many. No method will be found
more effectual for this purpose, or more easy, than the following.

Provide a piece of square card or pasteboard, and draw a circle on it,
which circle is to be divided into 27 equal parts, in each of which
parts must be written _one_ of the capital letters of the alphabet,
and the &, as in the figure. Let the centre of this circle be blank.
Then draw another circle, also divided into 27 equal parts, in each of
which write one of the small letters of the alphabet, and the &. This
circle must be cut round, and made exactly to fit the blank space in
the centre of the large circle, and must run round a pivot or pin. The
person with whom you correspond must have a similar dial, and at the
beginning of your letter you must put the capital letter, and at the
end the small letter, which answer to each other when you have fixed
your dial.

Suppose what you wish to communicate is as follows:

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