Physical Amusements and Diverting Experiments. Giuseppe Pinetti

be looked upon as a plagiary. Unacquainted with this town, I cannot be informed of all that exists in print: besides, as in this age the study of natural philosophy is so universal, it cannot be in the least astonishing if some of the experiments resulting from that science were already known. Therefore I claim by anticipation the indulgence of those who read this work. My only wish is to be so happy as to unite in this book the clearness and precision necessary to enable my readers to perform what is contained in each chapter. My project on my return to this metropolis, is to endeavour to obtain again the suffrages of the nation, by performing some new experiments. To reveal on this occasion those which I have performed till now, would be hurtful to my fortune: besides, most of them require a great deal of mechanism and great preparations. Others depend on much dexterity and subtilty; which are out of my power to give, and out of a possibility to be communicated in writing.

      If this feeble Essay, which I have the honour of presenting to the public, is favourably received, I promise on my return, and after I have merited their favour, to publish the means I have used to execute all I have performed.

      PHYSICAL AMUSEMENTS

       AND

       DIVERTING EXPERIMENTS.

CHAP. I.

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       Curious Method of restoring to Life, in two Minutes, a Fly that has been drowned even twenty-four Hours.

      This wonderful experiment, like many others, is produced by a very simple cause. Take a fly, put it in a glass or cup full of water; cover it so as to deprive the fly of air; when you perceive it to be quite motionless, you may take it out and put it on a place exposed to the sun, and cover it with salt: in two minutes it will revive and fly away.

CHAP. II.

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       To make a Colour that will appear or disappear by Means of the Air.

      Take a smelling-bottle; put in it some alkali volatile, in which you have dissolved some copper filings: this will produce a blue colour. Present then the smelling-bottle to one of the company, desiring him to stop it; and, to their great astonishment, the colour will disappear as soon as the smelling-bottle is stopped: you will make it easily re-appear by taking off the cork, which will be not less surprising.

CHAP. III.

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       A Method of drawing a deformed Figure, which will appear well proportioned from a certain Point of View.

      Draw any thing you may fancy on a thin white pasteboard; then prick it; afterwards put the same on an horizontal surface, which we will suppose to be another pasteboard. Put a lighted candle behind that drawing, and draw on the horizontal surface the lines given by the light: this will give a deformed design. This being done, take away the drawing that was pricked and the candle; then place your eye where the light was, and you will see your drawing assume a regular form.

CHAP. IV.

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       To change the Colour of a Rose.

      Nothing more is wanting to change the colour of a rose, whether it is on its stalk or not, but to burn some sulphur under it; which will make it turn white, and it will not regain its primitive colour in less than two hours.

CHAP. V.

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       To render hideous the Faces of all the Company.

      Dissolve some salt and saffron in some spirits of wine; dip a little tow in it and set fire to it. At this light, those who are of a fair complexion will appear green, and the red of the lips and cheeks turn to a deep olive colour.

CHAP. VI.

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       Method of Engraving in Relief on the Shell of a new-laid Egg.

      Chuse an egg that has a thick shell; wash it well in fresh water; then dry it very carefully with a linen cloth; this being done, put some tallow or fat in a silver spoon; then hold it on the fire; when the fat is melted and very hot, it will serve instead of ink for drawing with a new pen whatever you like. This being finished, you are to take the egg by the two ends between two fingers, and then lay it gently in a tumbler filled with good white wine vinegar; wherein, after remaining for three hours and an half, the acid of the vinegar will have eaten enough of the thickness of the shell; and as it cannot have the same effect on those places that are covered with the fat, all the drawing will have preserved its thickness, and will form the relief that is wanted, the operation sought for.

      By this means one may draw on an egg a coat of arms, a mosaic piece, medallion, or any other design whatever.

CHAP. VII.

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       How to shoot a Swallow flying, with a Gun loaded with Powder, as usual; and after, to find Means to bring it to life again.

      Load your gun with the usual charge of powder, but instead of shot put half a charge of quicksilver; prime and shoot: if your piece bears ever so little near the bird, as it is not necessary to touch it, the swallow will find itself stunned and benumbed to such a degree, as to fall to the ground in a fit. As it will regain its senses in a few minutes, you may make use of the time by saying, that you are going to bring it to life again; this will astonish greatly the company; the ladies will no doubt interest themselves in favour of the bird, and intercede for its liberty: sympathizing with their feelings for the little prisoner, may be the means of some of them sympathizing with yours.

CHAP. VIII.

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       To make a Calve’s Head bellow as if alive, when dressed and served up.

      This is effected by a simple and innocent stratagem; it consists in what follows: take a frog that is alive, and put it at the farther end of the calve’s head, under the tongue, which you will let fall over it; taking care not to put the frog there till the calve’s head is going to be served up.

      The heat of the tongue will make the frog croak; which sound, coming from the hollow part of the head, will imitate the bellowing of a calf as if it were alive.

CHAP. IX.

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       A puzzling Question to be proposed for Solution.

      Set down three sums on paper; and say to the company, ladies and gentlemen,