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Adams ~ London ~ Surveyors Compass
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Adams ~ London ~ Surveyors Compass
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Adams ~ London ~ Surveyors Compass c.1790-1820 An amazing miniature tripod type surveyors compass - over-all, stands slightly less than 5" tall with leveling base. I believe that when first made, this compass had a telescopic scope - instead of the 1-1/2" tall sight vanes it has now....but thats only a guess. Made by Adams - London- which Adams is unclear, t are many undated instruments signed "Adams"; it is impossible to tell whether George 1, George 2, or Dudley Adams is the maker in question - See: ADAMS 2- Websters Database Alder Planetarium. Compass top measures 4" across & slightly beveled on the outside top rim - - and Graduated 360 degrees in 1 degree increments on the outside top rim. Compass overall 0.06930" thick Brass Magnifier - Top eye-piece 5/8" diameter - - 3/4" tall on a 1-1/4" hinge that swings 180 degrees.... Magnifier vernier reads left to right 30-15-0-15-30 Magnifier optics clean & crisp Sight vane to sight vane 4-24/32" Sight Vanes 1- 3/4" over-all height and 7/16" wide Brass pivot - 2-1/4" fire blue needle - Needle swings free, and the polarity has not been switched. 2-15/16" Silvered step azimuth ring divided into quadrants in 1 degree increments Silvered Compass Dial measures 2-5/8" Adjustable bearing / Line of sight - azimuth adjustment - knob underneath and horizontal to the compass - opposite magnifier - - Entire compass turns, but the sight vanes and magnifier stay stationary Bearing adjustment knob is knurled brass and measures 1" in diameter..... extends approx 1" below compass plate on a hinge like arm that swings upright - downward - 180 degrees , All Brass - 4- screw Leveling Base about 2-3/4" tall - top plate 1.9565" diameter - bottom plate 1.9905 diameter. Level screws 1- 5/16" long and knurled thumb wheels 0.6320" diameter - Threaded female tripod socket 0.8125" or 13/16" with plus or minus - 20 threads per inch Condition: Compass portion - - - Compass crystal intact and appears to be original to the compass- Compass and step azimuth silvering tarnished and t is light spotting- Dust and dirt under glass-- The glass is removable by popping out the split-ring retainer ring - - if one is so inclined. Over-all condition is excellent .....some very light spotting and scratching on the brass, a few very minor nicks and dings. The screws that hold the sight vanes become loose very easy... T is a missing mini screw underneath compass on the out rim...of the 23 some odd screw heads underneath - 4 or 5 of screw slots on the screw heads have slight damage. T is a hole or casting pit underneath compass dial - opposite near the West point. A trace of black paint missing from the top of the magnifier eye piece. Leveling Base portion - - - Over-all condition, is excellent .....some very light scratching on the brass, a few very minor nicks and dings. One of the level screws is slightly bent - but will operate the full length of the threads. The 1/2" screw head that holds the level base together has some minor damage to the screw slot. For More Information about Payment, Shipping and Returns ---Please Read the Information On Ebay My World... or click on the - me - Questions ...Comments ? Additional Pictures Upon Request Check out my other items ! Be sure to add me to your favorites list ! Adams ~ London ~ Surveyors Compass 
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