Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 4692775 | Device to monitor press fittings Apparatus for monitoring the progress of operations on mechanical components, such as the fitting of railcar wheels to axles, includes a tachometer monitoring motion of the press ram and generating pulses indicative of increments of forward and rearward m... | 09/08/1987 |
| 4112761 | Liquid level measuring apparatus This invention relates to an apparatus for measuring and recording the changes in magnitude of a variable. The apparatus includes a recording stylus or pencil and a means for carrying a recording medium such as marking paper. The stylus or the means for c... | 09/12/1978 |
| 4036055 | Liquid level measuring apparatus This invention relates to a liquid level measuring and recording apparatus which includes a recording stylus or pencil and a means for retaining a record such as marking paper. The stylus is connected to a float means which follows the level of the liquid... | 07/19/1977 |
