Air Condenser

A static condenser whose dielectric is air. The capacity of an air condenser in farads is equal to A / ( 4.452E12 * t ) in which A is the area of one sheet or sum of the areas of one set of connected sheets in square inches and t is the thickne of the layer of air separating them. A convenient construction given by Ayrton consists in a pile of gla plates P separated by little bits of gla F of known thickne , three for each piece. Tin-foil T is pasted on both sides of each piece of gla and the two coatings are connected. The tin-foil on each second plate is smaller in area than that on the others. The plates are connected in two sets, each set comprising every second plate. For A in the formula the area of the set of smaller sheets of tin-foil is taken. By this construction it will be seen that the gla does not act as the dielectric, but only as a plane surface for attachment of the tin-foil. Posts E E keep all in position. One set of sheets connects with the binding post A, the other with B. The capacity of any condenser with a dielectric of specific inductive capacity i is given by the formula: ( i *A^1 ) / ( 4.452E12 * t1 ) The air condenser is used for determining the value of i for different dielectrics. IMG:8956969607833025625_015F6.jpg: Fig. 6. AIR CONDENSER. 15  STANDARD ELECTRICAL DICTIONARY.