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This instrument invented by Edme RegnierÂ (1751-1823) to measure muscle force, was used for assessing human muscle force and determining clinical progression of neuromuscular weakness. With this Dynamometer we can measure two types of forces : â€ Pressure forceâ€ by gripping and squeezing the double steel bow, andÂ â€œTraction forceâ€Â by pulling a single bow. Applying the forceÂ two dial handsÂ move up together, but one stop at the maximum force achieved, while the other follows the grip or pull up or down to show the current force strength. Two scales are engraved on the brass dial plate, in italian language â€œScala di trazioneâ€Â andÂ â€œScala di Pressioneâ€ .
In this italian version made in the mid 19th centuryÂ instruments maker â€œAmadori in Bolognaâ€Â we can find two others written engravings â€ Forza delle Reniâ€Â (Strength of the Kidneys) with an arrow indicator. And : â€œForza Ord.a Delle Maniâ€Â (Ordinary Force of the Hands).