LosTech

LosTech simply put refers to Lost Technology. Methods and Machines which were once in regular use but to which the methods of their manufacture have been in one way or another forgotten. The Term has it's origins in Battletech but the basic concept applies to various franchises.

Warhammer 40,000

In Warhammer 40,000], LostTech is another term for Archeotech, which shares the same basic idea; hyper-advanced technology left over from the Dark Age of Technology, where humanity had attained superscience that let them hold off the pre-Fall Eldar.

Real Life

• Concrete: Various forms of Concrete using (among other things) cement and volcanic ash were widely made during the Roman Empire, but the methods of producing these were lost in previous centuries.
• Plumbing: Some Four Thousand Years ago the Bronze Age Indian City of Mohenjo Daro had a complex sewer system. During the Classical Era it became the norm for cities to have sewers and during the Roman Empire public water supplies were fairly common with fountains and private plumbing for the rich. After the collapse of the Roman Empire, both would fade away in Western Europe.
• Greek Fire: