J.H. Stewart Polyphase Duplex Slide Ruler

🏷 J.H. Stewart Polyphase Duplex Slide Rule

🔎 This item remains in good condition, though there is a name written on its reverse side.

📐 Length 30cm x Width 3.3cm

📝Front side (polyphase-folded logs for rapid power/root work)
- DF and D (bottom of fixed slide; top of stock)
- CF and C (top of movable slide; bottom of fixed slide)
- CIF (inverted folded log on slide)
- One or more LL (log-log) scales, conventionally LL01 & LL02, for exponentials and roots
Back side (standard duplex scales plus trigonometry)
- A and B (squared scales for rapid square/cube root)
- K (cube-and-cube-root scale, often in three segments)
- S and T (sine and tangent)
- L (linear log-mantissa scale)
- CI (inverse C)

🙏 Please review the pictures for the condition of the item and feel free to contact us if there are any questions or requests. Notice the meaning of icons:  🏷𝘛𝘪𝘵𝘭𝘦   🔎𝘊𝘰𝘯𝘥𝘪𝘵𝘪𝘰𝘯   📐𝘋𝘪𝘮𝘦𝘯𝘴𝘪𝘰𝘯𝘴   📝𝘙𝘦𝘴𝘦𝘢𝘳𝘤𝘩𝘦𝘥 𝘯𝘰𝘵𝘦𝘴.

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