The Chinese Solar Machine Layer by Layer Fire in the Library The Mystery Behind Anesthesia
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For something a little more exotic, you could give someone a fully electronic $235 Enigma-E or a $10 Paper Enigma, the latter being well suited for children. Both can make and break codes with historical accuracy. Also good for children is the Digi-Comp I v2.0, which costs just $55. It's an amazing computational trainer that anyone can build in an afternoon.
Tore Bekkedal, a collector from Oslo, Norway, says the various replicas are good news for common hobbyists like him. "They replicate not only the fascinating technology, but also the tinker spirit," he says. "It also helps preserve the software and the knowledge of how to work it."
Manufacturing in the United States is in trouble. That's bad news not just for the country's economy but for the future of innovation.
This document is part of the “How-To Guide for Most Common Measurements” centralized resource portal. This tutorial provides a detailed guide for measurement and device considerations to take temperature measurements using thermocouples. Get an introduction to thermocouples, which are inexpensive sensing devices widely used with PC-based data acquisition systems. Also review some specific thermocouple examples and learn how thermocouples work and ways to integrate them into a data acquisition measurement system.
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jfreidin
5 Comments
IMSAI 8080
Please let's not forget the lesser-known, but equally capable IMSAI 8080. I built one of these during my junior year of high school in 1975 (I think). The front panel was gorgeous. Too bad I didn't know about investing back then. http://www.obsoletecomputermuseum.org/imsai/
It looks like you might be able to buy one here:
http://www.imsai.net/
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