Wehman Bros.' new book of one hundred and fifty parlor tricks and games : home-made apparatus . age will again appear if the plate be breathed upon. Theexplanation is simple. Obtain a square piece of glass, any sizeyou choose, and draw upon it any design you choose with somefluor-hydric acid, which is obtained by dissolving somepowdered fluorspar in the ordinary sulphuric acid of com-merce. When it is sufficiently liquefied the figure should betraced on the glass with a quill pen. Leave it for a few min-utes—five to ten at the most. Wash the glass and dry it TRIOKS 43 well. Then when it is bre
Wehman Bros.' new book of one hundred and fifty parlor tricks and games : home-made apparatus . age will again appear if the plate be breathed upon. Theexplanation is simple. Obtain a square piece of glass, any sizeyou choose, and draw upon it any design you choose with somefluor-hydric acid, which is obtained by dissolving somepowdered fluorspar in the ordinary sulphuric acid of com-merce. When it is sufficiently liquefied the figure should betraced on the glass with a quill pen. Leave it for a few min-utes—five to ten at the most. Wash the glass and dry it TRIOKS 43 well. Then when it is breathed upon the figure or designwill appear. A little experience will decide the length of time requisitefor the proper production of the figure; the acid if left toolong will eat into the glass, and the design will remain visi-ble even on the dry surface. Trick with a Balanced Coin. Procure a strip of notepaper about six inches long by halfan inch wide; lay this on the table, and stand a coin, edgeupward, upon the paper, which should project as far as pos-sible over the edge of the Now challenge anybody to take the paper away withoutknocking the coin over. Any one unpossessed of the secret will fail to accomplishthis, because at the slightest touch the paper will cause thecoin to overbalance. The only way to do this trick is by giving the paper asmart hit with the back of a knife; the paper will then beknocked away and tire coin left standing. 44 TF5IOKS Ice Made in a Drawing-Room. The following is a simple and singular method of freez-ing water: Take a jam jar, fill it with powdered sul-phate of soda, and pour on the saline material as muchmuriatic acid as will render it semi-fluid; then fill a testtube with water as cold as you can procure, and put it intothe centre of the chemical mixture. Let it remain at restfor ten minutes or so; finally, take out the tube and wipe itdry. You will find the water frozen. To get the ice out ofthe tube, dip it for an instant into w
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