. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . tional to thearea of the conductors and inversely to the distancebetween them. A familiar form of condenser is thatknown as the Leyden jar (Fig. 8). This is constructedby coating with tinfoil the inside and outside surfacesof a wide-mouthed glass jar. The upper part is leftuncoated so that the conductors will be insulated fromeach other, and an insulated rod passing through thelid serves to make connection with the inside. Anordinary Leyden jar of the gallon size has a capacityof two or three thous
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . tional to thearea of the conductors and inversely to the distancebetween them. A familiar form of condenser is thatknown as the Leyden jar (Fig. 8). This is constructedby coating with tinfoil the inside and outside surfacesof a wide-mouthed glass jar. The upper part is leftuncoated so that the conductors will be insulated fromeach other, and an insulated rod passing through thelid serves to make connection with the inside. Anordinary Leyden jar of the gallon size has a capacityof two or three thousandths of a microfarad, and isequivalent to a single spherical conductor one or twomiles in radius. Another form of condenser is used when a largercapacity is desired. It is composed of a number ofsheets of tinfoil separated from each other by some-what larger layers of an insulator, such as mica orpaper soaked in paraffin. The alternate sheets of tinfoilare connected together, thus forming the two conductors. The arrange-ment of plates is shown in Fig. 9, where the heavy lines represent the. Leyden jar. ELECTROSTATIC INDUCTION 33 tinfoil sheets and the Hghter ones the insulating layers. The whole isenclosed in an insulated case for protection and is provided with bindingposts for making connections. A condenser of this type is shown inFig. 10. This really consists of ten separate condensers, each of onemicrofarad capacity, and ten having each one-tenth microfarad capa-city. One side of each condenser is connected to one binding post, while Fig. 9 Plate condenser. the other side connects with one of a series of knobs, which can besuccessively connected with the second binding post by turning a whole condenser is contained in a box about a foot square; a singleconductor of this size would have only about one-millionth of the type of condenser cannot be charged to very high potential,as the insulating sheets between the plates are so thin that they mightb
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