Micrometria, hoc est, de micrometrorum, tubis opticis seu telescopiis & microscopiis applicandorum varia structura ac usu multiplici opusculum, cum observationibus astronomicis, tum & aliarum rerum dimensionibus plurimum inserviens
Micrometria is a 1710 Latin treatise on micrometers for telescopes and microscopes, written by Theodor Balthasar and printed in Germany for astronomers and instrument makers. Its plates are dense, precise engraved diagrams of lens geometry, circular scales with gridded fields, and sighting setups, offering a designer clean, technical linework and geometric figures with lettered labels.
