Symbols

The following list gives the symbols used through the several articles appearing in this issue of the J O U R N A L . The list does not include all the variant forms of the different symbols distinguished by subscripts, as these distinctions are indicated in the context where they are used. MECHANICAL: a ( m T V x Cross sectional area Length Effective armature mass Kinetic energy Work done to overcome static load Armature displacement ELECTRICAL: e E G GC GE G'E GS i I m N L NI q Copper efficiency or fraction of the copper volume occupied by conductor Applied battery voltage Total equivalent single turn conductance Equivalent single turn conductance of coil; N2/R Equivalent single turn eddy current conductance Effective single turn eddy current conductance; GEe~c'El'Gc+Gs) Equivalent single turn conductance of sleeve Instantaneous current Steady state current Mean length of turn in winding Number of turns in winding 47r Single turn inductance; ^ ^ Ampere turns Ratio of just operate to final ampere turns; ^^ 257 NIO Just operate or just release ampere turn value 258 T H E BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1 9 5 4 p R S v W Resistivity of material Resistance Coil volume Ratio of flux attained at time t to steady state flux Power; I~R MAGNETIC: A Equivalent pole face area A2 Effective pole face area (design value) B Induction (flux density) B' Value of B for maximum permeability B" Saturation density B M Density at N = 1000 BR Remanence (density at H = 0) ^ (Ro +