To prove its accuracy, Joseph devised the simplest of demon- strations to validate his machine’s astonishing accuracy. He first measured a one-inch bar at room temperature, showing it to be exactly one inch long. Next, he touched his fingertip to the bar for a brief moment causing the bar to warm ever so slightly. He then immediately re-measured the bar and showed that it was now one-millionth of an inch longer. This tiny increase in temperature caused the bar to expand by one-millionth of its length, and stun- ningly his machine measured this microscopic change perfectly.
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