Vintage Mechanical Diagram with Spring and Weight

A detailed vintage engraving presents a mechanical apparatus, most likely an early form of a spring scale or a device designed for measuring force and weight. The central feature is a substantial helical spring, internally labeled 'Fig 1', which is connected at its upper end to an ornate circular dial or indicator marked 'Fig 2'. From the bottom of the spring, a hanging pan with various weights is depicted, suggesting its use in practical measurement. To the left, a tall vertical rod, labeled 'Fig 3', suspends a single heavy weight at its base, possibly serving as a reference or counterweight in the experimental setup. The diagram is meticulously labeled throughout with letters and numbers, characteristic of scientific and engineering illustrations from historical periods.

vintage - mechanical - spring scale - scientific diagram - historical instrument - physics experiment - weights - measurement