TransactionsPublished under the care of the General Secretary and the Treasurer . inthat particular section of the armature circuit. This may be calledthe minor insulation. It is determined in the main, as are all low-potential insulations, so as to meet structural and mechanical re-quirements without undue expense. Over the coil as a whole thereis applied a carefully constructed covering made of the most power-ful available dielectric having an ample strength to withstand con-tinuously in practice the strains due to the total generatedin, or applied to, the circuit of this armature. T
TransactionsPublished under the care of the General Secretary and the Treasurer . inthat particular section of the armature circuit. This may be calledthe minor insulation. It is determined in the main, as are all low-potential insulations, so as to meet structural and mechanical re-quirements without undue expense. Over the coil as a whole thereis applied a carefully constructed covering made of the most power-ful available dielectric having an ample strength to withstand con-tinuously in practice the strains due to the total generatedin, or applied to, the circuit of this armature. This outer coveringmay be called the major insulation. While this represents the best. Fig. 1. practice that has as yet been attained, it contains one element ofserious weakness as follows : The dielectric flux starts from the surface of the outer conductorsand traverses the minor and major insulations in series and stopsat the surfaces of the slot. Xote the relative values of the densitiesof dielectric flux passing the two concentric zones in the insulationabout the coil; the inner zone is located by the irregular outer sur-face of the conductors of the coil and the outer zone by the regularwalls of the slot. The dielectric flux passes from the surfaces ofthe outer conductors of the coil to the walls of the slot and in sodoing traverses these zones. It passes the inner zone at considerableirregularity in density and the outer zone at a much more nearlyuniform density. The sectional area determined by the innerzone is considerably less than that determined by outer these two classes of facts it follows that the maximum dielec- 582 RYAX: HIGH-PRESSURE INSULATIO
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