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THACHER’S Calculating Instrument with Manual 1914-RARE
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THACHER’S Calculating Instrument with Manual 1914-RARE
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This auction is for a Thacher’s Calculating Instrument Made by Keuffel and Esser of New York in 1914. The instrument is a cylindrical slide rule patented by bridge engineer Edwin Thacher. The instrument itself measures about 4 ½ inches by 20 inches. It has 20 scales on a drum that rotates and slides inside a rotating barrel with another 20 scales. The cylinders have mahogany knobs on the ends and are mounted on a brass frame, and the frame is mounted on a mahogany wood base. The base has paper directions and rules mounted and covered with shellac or something similar. This instrument has the original instruction manual and comes in a wooden box (probably maple) with a removable lid. This is apparently a very rare antique as I have been watching for other sales or auctions and have found some for the manuals, but not the instrument itself. This instrument appears to have been well used, but also well taken care of. My father worked for Southern Pacific Railroad and got it decades ago from a railroad station that was closing. The scales are somewhat yellowed (but very evenly) and have a few smudges. They could probably be cleaned up nicely (I was afraid to try.) Every number and every tic mark is clear and legible. There are no cracks, dents, tears or any other visible damage to the scales. They turn and slide smoothly. Of course the brass frame is tarnished, but is undamaged. The base has some nicks and corner wear, and has small initials “CPG” on it, but is in good shape. The model number, trademark logo, and Keuffel and Esser logo are clearly visible on the base. The mounted directions are somewhat yellowed and smudged and partly missing on the front edge, but are about 95% legible. The storage box is in pretty good shape, but has a small chip in one corner of the lid and the name “Chet Reid” written on it. A tag with “1468” on it is stapled to one end. The directions manual is complete and fully legible, but has some minor edge wear and is missing the lower right corner of the front cover. Although I try to be completely detailed and honest with my descriptions, I have provided several pictures so bidders can evaluate this item for themselves. I will also try to answer any questions sent to me. It will be shipped promptly upon receipt of payment, and will be carefully packaged. The box measures 7x8x25 inches and the whole package weighs about 13 lbs without shipping materials. The winning bidder will pay $40.00 shipping and handling to U.S. locations only.
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