1927 Article Radio Tube Pressure Scientific Diagrams E. V. Simdt Electric SI1

This is an original 1927 one-page article (one single-sided page) by E. V. Smidt on the pressure contained inside a typical radio tube, as well as information on a Simple Electric Motor by Earl Aldridge and a Touring Switch for one's car by Guy E. Mcallan. CONDITIONThis 84+ year old Item is rated Near Mint / Very Fine. Light aging throughout. Light creasing. No natural defects. Some light surface rub. No tears. No water damage. Please note that there is print on the reverse, thus some bleed through may be visible. Product Type: Original Print Article; Black / White Grade: Near Mint / Very Fine Dimensions: Approximately 7.75 x 10.75 inches; 20 x 27 cm Authentication: Serial-Numbered Certificate of Authenticity w/ Full Provenance Protection: Packaged in a custom archival sleeve with an acid-free black board (great for display, gift-giving, and preservation) Keywords specific to this image: Car Parts, Woolworth Building, Skyscrapers, Calibration SI1A6C27