Gray/Black AO No27 Stereo Microscope-Dual Rack-Pinion Focusing & Lens Protector, US $2000 – Picture 0

Gray/Black AO No27 Stereo Microscope-Dual Rack-Pinion Focusing & Lens Protector, US $2000 – Picture 1

Gray/Black AO No27 Stereo Microscope-Dual Rack-Pinion Focusing & Lens Protector, US $2000 – Picture 2

Gray/Black AO No27 Stereo Microscope-Dual Rack-Pinion Focusing & Lens Protector, US $2000 – Picture 3

Gray/Black AO No27 Stereo Microscope-Dual Rack-Pinion Focusing & Lens Protector, US $2000 – Picture 4

Gray/Black AO No27 Stereo Microscope-Dual Rack-Pinion Focusing & Lens Protector, US $2000 – Picture 5

Gray/Black AO No27 Stereo Microscope-Dual Rack-Pinion Focusing & Lens Protector, US $2000 – Picture 6

Gray/Black AO No27 Stereo Microscope-Dual Rack-Pinion Focusing & Lens Protector, US $2000 – Picture 7

Gray/Black AO No27 Stereo Microscope-Dual Rack-Pinion Focusing & Lens Protector, US $2000 – Picture 8

Gray/black Ao No27 Stereo Microscope-dual Rack-pinion Focusing & Lens Protector

US $2000

Cochran, Georgia, United States
Jun 9th

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Grey/Black AO Model 27 Stereomicroscope with Dual Rack and Pinion Focusing and Protective Glass _________________________ The American Optical (AO) Company and the C. A. Spencer & Sons Company started as independent entities. AO began in 1833 as an eyeglasses manufacturer in Southbridge, Massachusetts. Charles A. Spencer began in the late 1930s as, perhaps, the earliest successful American microscope manufacturer, working initially out of Canastota, New York and after a number of moves out of Buffalo, New York. New York State was also the home of the Bausch and Lomb Optical Company. In 1935, AO bought the Spencer Lens Company, and after this purchase, many of their microscopes carried the AO Spencer designation, eventually changing to simply AO. For sale here is a American Optical (AO) Model 27, ca. 1950s. It has a fixed magnification with wide field 10x AO eyepieces and a 2x ojective. The clips under the objective hold a protective glass cover, present here but often missing. The clips present are to hold the optional protective glass. They are not for holding slides, as they move with the focusing adjustment mechanism. The protective glass cover can be removed if maximum optical performance is desired, without any compromise in stereomicroscope functionality. The picture through this microscope was taken with the protective cover in place. Condition of the instrument is perhaps somewhat better than age might suggest. This stereomicroscope is relatively unique in having two independent rack and pinion focusing mechanisms to allow for a significant height variation above the object under examination. It can be tilted anywhere between approximately 0 – 90 degrees (see photographs). This allows significant flexibility in the size of objects to be examined. To accomplish this it has a a built-in rotation joint, This flexibility is also aided by the lack of a formal stage, the microscope opting instead for a solid, and heavy, base allowing it to be used in a variety of positions with a myriad of objects. This stereomicroscope weighs about 8 pounds 13.4 ounces. The instrument is approximately 10 inches tall in working position, as shown as illustrated. It can be raised to over 13 inches using both rack and pinion focusing mechanisms, as shown in the photographs. The two rack and pinion mechanisms work properly, as does the interocular spacing and diopter adjustments. As noted, to allow this stereomicroscope to be used at in a tilted position, the base is quite heavy to provide stability. This is a later variation of the AO model 27, as earlier versions of the stand were made entirely in black. The total magnification seen through this stereomicroscope is 20x. Other magnifications are possible using readily available eyepieces of different magnification. Only a single pair of dual matched 10x wide field eyepieces is included in this listing. The photograph through the microscope shows a portion of the seal on US bill. The bill is not included in this sale. -- © RJK 2014 Authorized __________ No need for concern about stock picture matching the item for sale. PHOTOGRAPH OF THE ACTUAL ITEM FOR SALE These pictures are part of this listing, and we hope they can answer most questions. All items included in this sale are shown. However, feel free to ask any questions you may need answered to make an informed decision. We will do our best to answer them. __________ To help keep buyer costs as low as possible, we ship via economy shipping, which although less expensive takes longer. However, we recognize that some buyers would prefer to receive their package as quickly as possible. If this is you, we offer expedited shipping at cost. There is no cost for packing materials or handling. If you select this option, please let us know at auction close by sending an eBay message, Do not rely on a message sent through PayPal as these are not always seen. We try to ship items as quickly as possible. If you do not select expedited shipping, no worries we will mail your purchase out quickly via economy–mail. __________ We are proud of the 100% feedback and over 1,600 transactions we've had on eBay over the past 15 years. We would like you to be as pleased with your purchase. If for any reason you are not 100% satisfied, please let us know. We will work to fix your problem quickly and satisfactorily. You will never need to open a case, or leave neutral or negative feedback. We will be pleased to work with you to correct any issue quickly and satisfactorily.