Vintage Manual Sonometer ducks allowing the lamp to be

allowing the lamp to be positioned in a variety of ways

it does exhibit some wear and patina

MM - 301242 - 032323

Exhibits moderate signs of wear including stains and rust

& Gasket Co

Vintage Manual Sonometer ducks allowing the lamp to bec. 1950s 1960s; W. M. Welch Scientific Co. Chicago Hand crank sonometer, a musical and scientific laboratory instrument used to measure musical instrument string tension and wave mechanics. It works as such (from NYU): The sonometer lays flat on a large surface. There is a meter stick attached for reference. Strum the strings freely or hold down the string in different positions like a capo, to achieve different notes. Strike the tuning fork and strum