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Case Auctions
Live Auction

2022 Fall Fine Art & Interiors

Sat, Oct 8, 2022 09:00AM EDT
Lot 557

2 Circular Slide Rules, incl. Eckel Engineer's & RotaRule 510

Estimate: $400 - $450

Bid Increments

Price Bid Increment
$0 $10
$100 $25
$500 $50
$1,000 $100
$3,000 $200
$5,000 $500
$10,000 $1,000
$20,000 $2,000
$50,000 $5,000
$100,000 $10,000
1st item: Eckel Dial-O-Matic Engineer's or Engineer's Log Log slide rule, manufactured by Lithocalculator Company, Arcadia, California, circa 1955. Comprised of two celluloid-coated aluminum disks, one on top of the other, with a clear plastic cursor, the end piece held together with a metal screw. Includes an instruction manual for the Layman's model with additional insert for the Engineer's model, and a brown plastic case. Slide rule: 7 1/2" dia (includes cursor). 2nd item: RotaRule Model 510 50" pocket size circular slide rule, manufactured by Boykin Products Company, Ruxton, Maryland, circa 1963. Comprised of double-sided white plastic with a clear plastic cursor with a white plastic end piece held together with metal screws. Includes brown leather case, instruction manual, a Rota Rule parts lists, and a miniature screwdriver, with original box. Slide rule: 6" dia (includes cursor). Box: 8 3/4" H x 6 1/4" W x 1 1/4" D.


Slide rules in overall very good condition with expected surface wear. Boxes, cases, instruction manuals with minor tears, dampstaining, general wear to be expected from age and manner of use.

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Payment must be received no later than five (5) days after the sale.

If paying with a credit card, a 3% credit card processing fee will be applied to the final sales price (i.e. hammer price + buyer's premium + applicable taxes). If you have a credit card on file with Case, any winning bids will be automatically charged (up to $3000) along with applicable fees 72 hours after you receive your invoice unless other arrangements have been made.

If paying with wire transfer, please use the following information:
Bank: Pinnacle Bank
150 Third Avenue South, Suite 900
Nashville, TN 37201
Phone # (865) 766-3000
Swift Code: PNFPUS44
Routing, Transit, ABA: 064008637
Beneficiary: Case Antiques, Inc.
4310 Papermill Drive
Knoxville, TN 37909
Account #: NOT DISCLOSED (please refer to your invoice email for the Deposit Account Number or contact us )