A BOY’S WIRELESS OUTFIT MADE UP OF THE APPARATUS DESCRIBED IN CHAPTER XIV. THE JUNIOR DYNAMO AND A COHERER OUTFIT CAN BE SEEN ON THE LOWER PART OF THE TABLE. ...................................... Fig. 1.—The Card of a Mariner’s Compass, Showing the "Points." .... Fig. 2.—A Bar Magnet .............................................. Fig. 3.—A Horseshoe Magnet ........................................ Fig. 4.—A Magnetized Needle and a Bar Magnet which have been dipped in Iron Filings. .................................................. Fig. 5.—The Lifting Power of a Bar Magnet. _It must be brought closer to the nails than the tacks because they are heavier_. ..... Fig. 6.—A Simple Compass. ......................................... Fig. 7.—Several Different Methods of Making a Simple Compass. ..... Fig. 8.—The Attraction of an Iron Nail through _Glass_. ........... Fig. 9.—A Magnetic Chain. ......................................... Fig. 10.—An Experiment Illustrating that Like Poles Repel Each Other and Unlike Poles Attract. ......................................... Fig. 11.—A Magnetic Boat. ......................................... Fig. 12.—Repulsion between Similar Poles, Shown by Floating Needles. Fig. 13.—A Magnetic "Phantom," Showing the Field of Force about a Magnet. ........................................................... Fig. 14.—Magnetic Phantom showing the Lines of Force about a Horseshoe Magnet. ................................................. Fig. 15.—Lines of Force between Like and Unlike Poles. ............ Fig. 16.—A Simple Dipping Needle. ................................. Fig. 17.—An Electrified Glass Rod will Attract Small Bits of Paper. _From the author’s "Wireless Telegraphy and Telephony" by permission._ *A Double Lightning Discharge from a Cloud to the Earth.* ........................................................... Fig. 19.—A Piece of Dry Writing-Paper may be Electrified by Rubbing. Fig. 20.—A Surprise for the Cat. .................................. Fig. 21.—A Paper Electroscope. .................................... Fig. 22.—A Pith-Ball Electroscope. ................................ Fig. 23.—A Double Pith-Ball Electroscope. ......................... Fig. 24.—A Gold-Leaf Electroscope. ................................ Fig. 25.—Method of Suspending an Electrified Rod in a Wire Stirrup. Fig. 26.—Similarly Electrified Bodies Repel Each Other. Dissimilarly Electrified Ones Attract Each Other. .............................. Fig. 27.—The Electrophorous ....................................... Fig. 28.—An Electric Frog-Pond. ................................... Fig. 29.—Front View of a Cylinder Electric Machine. ............... Fig. 30.—Method of Finding the Center of a Circle. ................ Fig. 31.—The "Rubber." ............................................