. Practical electro-therapeutics and X-ray therapy : with chapters on phototherapy, X-ray in eye surgery, X-ray in dentistry, and medico-legal aspect of the X-ray . fact that spheres retain static charges better thanpoints or angles. Bring a charged ball near enough to the elec-troscope to affect it; now hold an insulated needle against the ball,pointing it toward the disk of the electroscope, and it will be foundthat the electroscope will be affected through a longer distance thanwhen no needle is used. CONDENSERS. The simplest form of electricalcondenser is the Leyden consists of a
. Practical electro-therapeutics and X-ray therapy : with chapters on phototherapy, X-ray in eye surgery, X-ray in dentistry, and medico-legal aspect of the X-ray . fact that spheres retain static charges better thanpoints or angles. Bring a charged ball near enough to the elec-troscope to affect it; now hold an insulated needle against the ball,pointing it toward the disk of the electroscope, and it will be foundthat the electroscope will be affected through a longer distance thanwhen no needle is used. CONDENSERS. The simplest form of electricalcondenser is the Leyden consists of a glass jar (), coated on the inner andouter side to a certain heightwith tin-foil. The inside coat-ing is connected to a metallic rodthat passes through the cork andterminates in a ball about threeinches above the cork. Such ajar may be charged by ground-ing the outside coating and con-necting the ball and inner coat-ing to the prime conductor of anactive static machine. If the jaris removed and the outside andinside coatings are brought neartogether by means of a wire ordischarge rod, a series of sparkswill pass between the dischargewire and the Fig. 18.—Leyden jar. 48 PRACTICAL ELECTRO-THERAPEUTICS AND X-RAY THERAPY ELECTRICAL GENERATORS. Electrophorus.—This simple form of electric generator () will well illustrate the principles underlying the action of thestatic machine. It will be seen that the process is one of bothfriction and induction. A is either a hard rubber plate, or a diskmade of resin and shellac and well rubbed with fur or flannel. Bis a metal plate with an insulated handle. When B is placed incontact with A and the upper surface touched with the finger and
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