CENCO’S LECTURE TABLE GALVANOMETER, American, c. 1930, signed “Central Scientific Co., Chicago.” Standing 14-1/2″ (37 cm) tall overall, with a circular wood base, three leveling screws, and a glass dome, the galvanometer has a permanent magnet (with patented rotation about the vertical axis for zero correction), a suspended copper wire coil attached to the double needle, and a double readout scale (front and back, for visibility from both sides). In Cenco’s catalogue we find that a deflection of one scale division is produced by a current of only 0.0000136 amperes. Condition is good except for a large crack in the dome, the needle suspension wire present but broken, and one terminal post missing.
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David and Yola Coffeen both have enjoyed academic careers, as planetary astronomer and as linguist/educator. But since 1982 (yes, 1982!) they have been full-time dealers in early scientific and medical instruments, under the name Tesseract. Selling primarily by catalogue (over 100 issued so far) they also have a web presence at www.etesseract.com, and can be contacted at [email protected].
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