History Weighing scale

a simple balance 19th century

although records dating 1700s refer spring scales measuring mass, earliest design such device dates 1770 , credits richard salter, scale-maker. spring scales came wide usage in united kingdom after 1840 when r. w. winfield developed candlestick scale weighing letters , packages, required after introduction of uniform penny post. postal workers work more spring scales balance scales because read instantaneously , did not have balanced each measurement.

by 1940s various electronic devices being attached these designs make readings more accurate. load cells, small nodes convert pressure (or force) digital signal, have beginnings late nineteenth century, not until late twentieth century became accurate enough widespread usage.