Vintage Davis Instruments T-S-D Computer – Nautical/Aviation Time Speed Distance

This vintage Davis Instruments T-S-D Computer is a circular slide rule designed to calculate time, speed, and distance for nautical or aviation use. Popular with boaters and pilots before the digital age, these durable tools remain collectible and functional today.

• Maker: Davis Instruments Corp., Hayward, California

• Type: Circular Time-Speed-Distance Computer (Slide Rule)

• Material: Sturdy yellow and white plastic with metal center fastener

• Size: Approx. 8” diameter

• Features:

• Outer and inner scales for quick calculations

• Distance conversions (nautical miles, statute miles, kilometers, yards)

• Original instruction label intact on the back

• Condition: Good vintage condition with light surface wear from age and use. Instruction label shows some wear but remains readable.

Perfect for collectors of nautical instruments, aviation memorabilia, slide rules, or vintage Davis Instruments tools.

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Item Specifics

• Brand: Davis Instruments

• Model: T-S-D Computer

• Era: Mid-20th century (likely 1960s–1980s)

• Function: Time, speed, distance calculations

• Condition: Vintage used, light wear, fully functional