[vecher]

All, Picked this up for 1.00 No clue what it is or what its for? Anyone care to take a shot??

[Image: https://farm2.staticflickr.com/1796/4204...857f_b.jpg]

[Image: https://farm2.staticflickr.com/1818/4294...9a82_b.jpg]


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[Patrick]

Welch Scientific made supplies and instruments for teachers. So it looks like it might be a device used to explain what phase shift is. But I don't have a clue as to how it would be used.