Instrument for measuring the strength of wires

Instrument for measuring the strength of wires

Instrument for measuring the strength of wires

Inv. 393
Interpretation by Arturo Uccelli, 1952

“Experiment of the strength of an iron wire of various lengths.”

The device designed by Leonardo consists of a simple container filled with sand and a bucket. Through a small shutter the sand slowly falls into the bucket which is suspended on a metal wire. When the wire brakes and the bucket drops, the sand stops falling. Thus one can calculate the braking point, repeating the experiment with different materials sustaining the weights. Leonardo also senses that the length of the wire has an influence on its resistance.

The model is based on the drawing:

  • Codex Atlanticus f. 222 r. (1493)
    Milano, Biblioteca Ambrosiana