Addendum - The SRT Scale

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"The SRT Scale"

Special Instruction Manual Adendum for the SRT Scale

The SRT scale was subsituted for the ST scale to the Log Log Duplex Decitrig (4081-3), the Log Log Duplex Vector (4083-3)and the Polyphase Duplex Decitrig (4071-3) slide rules in 1956. This new scale was first shown in the soft bound catalog edition in late 1955.