Here's my first attempt at producing purple science in a city block, no modules or beacons. Produces 4 purple science per second, which is probably insignificant to most, but I'm proud of
Factorio Cheat Sheet
Factorio Prints: Purple Science 0.17.e.20190512
Factorio Prints: Compact Science 0.17
factorio blueprint Tileable Science Production - Early to Mid Game
Factorio Blueprint Library
Factorio Cheat Sheet
Factorio Prints: Purple science.
Steam Community :: Guide :: Factorio Compact Designs