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Physical Amusements and Diverting Experiments / Composed and Performed in Different Capitals of Europe, and in London cover

Physical Amusements and Diverting Experiments / Composed and Performed in Different Capitals of Europe, and in London

Chapter 5: CHAP. II.
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About This Book

A collection of practical, theatrical experiments and demonstrations designed to amuse and astonish audiences, presenting clear, step-by-step instructions for optical illusions, chemical colour changes, simple mechanical contrivances, engraved relief work, and staged effects involving small animals and household materials. Each chapter explains the method of execution and the observable result, often noting how presentation and concealment enhance surprise. The work aims to enable performers and curious amateurs to reproduce entertaining physical phenomena with modest apparatus, while distinguishing easily executed tricks from those that require greater dexterity, mechanism, or preparation.

CHAP. II.

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.