The fiddl-ette

 The instrument on the right is a Fiddl-ette ca. 1930. This unusual  instrument was sold by the Gamble Hinged Music Co.. It was originally  created by Edwin H. Bergh and Carl Wheeler Mott as an inexpensive  student instrument. It was only produced in limited numbers for a very  few years, and sold in the Illinois and Wisconsin areas. (from my  personal collection)  

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UltraViolet light Evaluation

 UV  Lights are often used to evaluate the varnish on old instruments. By  the color differences, different layers, and ages of varnish can be  visualized. 

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using a usb endoscope

  An  endoscope can be a useful tool for evaluating the inside of  instruments. It allows you to see blocks, bass bar, and any repairs that  might have been done on the inside. A 5.5 mm endoscope allows you to  get in through either the f holes, or the end pin hole. Steering the  camera can be a little tricky. The pictures below were taken with an  inexpensive USB endoscope, with a LUTHIER LIGHT (tm) for lighting.

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 At  the VSA convention, a few years ago, I had the opportunity to light up  the inside of an Amati cello with a Luthier Light. With good lighting,  you can see every detail.