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KF5JRV > TECH 28.09.16 14:19l 16 Lines 577 Bytes #999 (0) @ WW
BID : 2643_KF5JRV
Read: GUEST
Subj: Circular Slide Rules
Path: IW8PGT<IZ3LSV<IW0QNL<JH4XSY<JM1YTR<JE7YGF<N9PMO<NS2B<N0KFQ<KF5JRV
Sent: 160928/1215Z 2643@KF5JRV.#NWAR.AR.USA.NA BPQK6.0.13
Circular Slide Rules
Drawing slide rule scales around a circle enabled a more compact instrument to be produced.
A circular slide rule with a 3-inch diameter can provide a 10-inch scale. Nevertheless,
circular slide rules were never very popular. There could be problems of parallax in reading
the scales but for their size they could be surprisingly accurate.
A variety of circular slides rules were manufactured by Concise in Japan. These were often
supplied with a firm’s name on for use as promotional give-aways.
73 Scott kf5jrv
KF5JRV @ KF5JRV.#NWAR.AR.USA.NA
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