HIGH PRECISION BAUSCH & LOMB B&L REFRACTOMETER Start Price USD 150.00 Current Price USD 150.00 Time Left - Bid Count 1 Buy It Now Price - Reserve Price - Start Time Friday, November 21, 2008 End Time Friday, November 28, 2008 Location Fleetwood, Pennsylvania See more about 'HIGH PRECISION BAUSCH & LOMB B&L REFRACTOMETER' Description surplusshed Store HIGH PRECISION BAUSCH & LOMB B&L REFRACTOMETER Search What a find. This unit came from our Wollensak building in Rochester, NY. Built in 1983 this High Precision B&L Refractometer is designed to give an order of magnitude of greater precision than the standard Abbe Refractometer. This unit measures to the fifth decimal rather than the forth decimal. This unit is an Abbe Refractometer turned on its side. Thus it can accommodate a heavy, vertical, lapped bearing like transits and spectrometers. This eliminates the mechanical sloppiness of the classic standard Abbe Refractometer. Originally this unit will has a sodium light source, but that piece did not make it back from the travel. The stand is still in tact and ready for the light source to be mounted.  The instrument is 12-1/2” tall by 15” long excluding the lamp arm and weighs 22 pounds. The unit is finished in black Japanese enamel. The scale and vernier are engraved on nickel-silver, while the crank knob is made of machined aluminum. The scale is numbered from 0-72 over 7/58” with graduations to the tenths place and the vernier reading is to the hundredths place. Come with focusing eyepiece and hand cranked which moves the vernier to the correct scale that you want. Attached to the movable vernier is a magnifier to better see the scale.   According to the literature description of this instrument the scale is divided to an accuracy of 2 seconds of arc (approximately 1 micron in linear measure n the scale). Though designed for an absolute accuracy of 2 or 3 in the fifth place, Bauer and Lewin state that the instrument appears to be accurate to only 6 in the fifth place in terms of reproducibility etc. As a comparison they also note that the Precision Refractometer was found to have a sensitivity "about twice as good" as the Zeiss sugar refractometer. Looks to be in good working order except the light source that you would have to provide. Happy Bidding!!! Images of planets are courtesy of NASA and STScI Hubble telescope website. Place a Bid!