The design and construction of a practical wireless telegraph station (1910)
Spurck, Robert Michael, Wheatlake, Burton Cyrenius Job · leaf 45
he writers was of the syntonic type hav-ing apx>arat\is arranged as in figure 12 A & B, Th« transformer, see P Figure 13, used is a three kilowattoil insulated one and has a 110-220 volt primary and a 40,000volt secondary. It was made by the Thoradson Company of Chicago.It was connected with… … K Pig. 14 The key was made from a block of oak wood six inches longsix inches wide and three and a half inches thick. In the topof the block near the center was chiseled a hole one inch longthree quarters of an inch wide and two and a half inches deep. 20
Telegraph stations · Telegraph, Wireless · Theses
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
![An illustration from M. Vitrvvii De architectvra libri decem : nuper maxima diligentia castigati atq[ue] excusi : additis Iulij Frontini De aqueductibus libris propter materiae affinitatem (1522)](https://img.insideoutlibrary.com/img/200/ia-mvitrvviidearchi00vitr-98-30.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten10unit-827-557.webp)
