Patent drawing - Submarine cable cross-section - . Public domain imag...
Cross-section diagram of a submarine communications cable
17101
Rosicrucian Rose (circular diagram of alchemical symbolism with seven planets at top, and Latin "VITRIOL" acronym around the circumference)
Rosicrucian Rose - A drawing of a circle with various symbols
Rosicrucian Rose -- circular diagram of alchemical symbolism with seven planets at top, and Latin "VITRIOL" acronym around the circumference .
Ratdolt sphaericulum - Public domain medieval manuscript
Schema zur Mondfinsternis. Holzschnitt, in drei Farben gedruckt, aus: Johannes de Sacro Bosco, Sphaericum opusculum, gedruckt von Erhard Ratdolt, Venedig 1485 Diagram, showing eclipse of the moon; woodcut, pri... More
Aemethms - Public domain sheet music scan
diagram from Bodleian Library Michael MS. 276, entitled Clavicolo di Salomone Re d'Israel figlio de David, an Italian language version of the "Key of Solomon" grimoire. It is a variant of the "Sigillum Aemeth"... More
Kircher-Diagram of the names of God
Diagram of the names of God in Oedipus Aegyptiacus
Dynamo - exaggerated rotating field distortion
TBD Public Domain source: Hawkins Electrical Guide, Volume 1 Chapter 19: Theory of the Armature, Page 264 Copyright 1917 by Theo. Audel & Co. Printed in the United States Photographed, reduced to grayscale, ... More
Looping
Diagram of a plane flying a loop.
Sagnac Phase Freq
Sagnac Phaseshift
