High frequency apparatus, design, construction and practical application; a practical treatise for electrical engineers, electricans, physicians, students and experimenters (1920)
Curtis, Thomas Stanley · New York, Norman W. Henley publishing company · leaf 271
n^ Ml f f P^ ^>3 fo P U) CO rffi ^^ r* /7\ 1 (J) (-^ o ?3 … M i2i g- Ml CJi t>» liJ B B p5 WWro
Electric apparatus and appliances
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Three books of occult philosophy / Written by Henry Cornelius Agrippa of Nettesheim. Translated out of the Latin into the English by J.F[reake]. (1651)](https://img.insideoutlibrary.com/img/200/wellcome-wellcome_b30335231-435-1.webp)
![An illustration from [Tovar Codex] (1582)](https://img.insideoutlibrary.com/img/200/ia-tovarcodex00tova-333-0.webp)
