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Questions related to the design, development, construction, and use of human-made objects. General tag for mechanical and electric systems, tools, machinery, building design and construction, military engineering, aircraft, and complex system design.

8 votes

Where is (or was) the biggest medieval drawbridge?

The book A History of Engineering in Classical and Medieval Times, By Donald Hill on page 63 in a discussion of bridges states: Timber is much weaker then steel, and simple beam bridges are limited to …
justCal's user avatar
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4 votes
Accepted

What is the true history of the blue bricks of Old San Juan?

There does seem to be a combination of myth and history concerning these blue slag cobblestones or adoquines as they are known in Spanish. The actual History surrounding these objects appears to be q …
justCal's user avatar
  • 41.4k
7 votes
Accepted

When were public roads cleaned electromagnetically?

Well, the truck was definitely real, not an artists concept sketch. An image gallery at the Nevada Department of Transportation website shows the following picture: The caption simply labels it as …
justCal's user avatar
  • 41.4k