This rare 1934 Smiths chronometric tachometer fitting an equally rare Peugeot 302 displays a unique "Average" rpm operating the needle in steps that are counterintuitively displayed as "average" increments by the needle.
Although some components are compromised by years of use, the delicate "Clutch Spring" operating within a hallowed out gear is still operating a step-cam as best as can be expected for a mechanism derived from a long-lost technology. Patience, observation, and help from a few savvy experts solve riddles that achieve results. We are lucky to know a few. My apologies for inventing the word Tacheometric. This is a Chronometric device.
