. The Bell System technical journal . : A a I (v> (18) Exact: (R = bin a I 2/-0/ Approximate: (R = —ab Lridis of apj)roximatioii: Less than 1 per cent if a < ,^/o Less than Id per cent if a < /o. Fig. 10 — Reluctance between inclined plane surfaces. aud/or x < -Io In Exact: (R = be Where b = length parallel to axis A])proximate: (ft = ,—bi-od Errors of approximation: Less than 1 [jer cent if /s < Less than 10 per cent if /••j < 3r,

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1