This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. SPRINGFIELD, Ill. (AP) _ Illinois plans to ...
The speed of an automobile can be indicated by detecting the pulses generated by the ignition system and causing an LED to light. The circuit utilizes a quad NOR gate IC chip. Two of the gates are ...
This small circular instrument measured spindle rotation speeds. The inscription on the face reads “McDonnell Odometer Co. / Chicago, Ill.” A label in the lid of the box reads “The Lightning Speed ...
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