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LONG LOST Co
This is a 5 Day NO RESERVE AUCTION that will end on SUNDAY, 6/30/25
This lot features an ANTIQUE SECTOR and PROTRACTOR. Though they were acquired together they are likely a “married” pair. I believe the Sector is 19th Century, perhaps the 1830-1870 range. The Protractor may be a bit later 1880-1910 (my opinions only). The Sector is 6”L (not including the hinge) x 1 3/8”W (closed) and 12”L (open) x 1/8”T. The Protractor is about 1 11/16”W x about 6”L and also about 1/8”T. Each has scales and info on both sides.
The Sector has sloping scales marked, on one side, S,T, & T as well as 3 linear scales along the edge labeled as T, S & N. On the other side, the sloping scales are marked L, S & C with an edge scale of 12 inches divided by 10ths, A linear scale along the outward perimeter has a scale of 11 units, also divided in 10ths, numbered as 10, 20, 30, 40 etc. There is no makers name on the Sector but it does have the initials “C.E.D.” in script (I’m guessing it to be the original owners initials).
I think it is made of bone, Perhaps OX or Whale bone, though it could possibly be some other off-white natural material as there are no “pepper” marks. The hinge is either nickel or silver. All the brass pins are present and in good order. The unit is flat and straight. Only light, appropriate wear, some “foxing-like” spots and very light scratches. Small, minor cracks appear at the innermost hinge pins on both sides. Overall, quite a nice example of this scarce instrument. I believe it to be all original and complete. The condition is as found, and as an antique, in my opinion is VERY GOOD PLUS to EXCELLENT.
The Protractor displays on the “front” various scales and measurements of distance as well as radial degree marks to half of a circle. it has a scale on either edge, one labeled “Scale of Slopes” marked in degrees, 1° thru 20° and the other labeled “YDs 8 INs to MILE”, marked in increments of 100. In the center is a chart Labeled “H.E. IN YDs”. With a Mathematical formula at the base. It too, appears to be made of bone or other off-white natural material. It is marked “ELLIOTT BROs LONDON”.
The condition of this piece is GOOD, owing only to a 2” chip from the edge (though still functional I would think). One corner is nicked and it has some overall wear and some short, light, curved scratches perhaps from a compass.
A very nice pair for the collector, historian, researcher, engineer or academia.
These instruments were used for all manner of engineering and mathematical calculations over a broad range of applications both common and industrial such as drafting, construction, range finding, cartography, machining, volume, area, gearing, leverage, power, navigation, ship building, military usage etc, etc. as well as simple and complicated math. Some even had scales for making watches, sundials and other specialties of the day. Galileo is credited by many for the development of the sector-rule in the late1500s, and most would agree that the sector was the precursor to the slide rule and was the computer of its day.
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