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Historical notes on wireless longitude
Back view of amplifier No 2
Outfit for radio longitude work
15 other sections not shown
75th meridian adjustment American Ephemeris amplifier Annapolis antenna antenna poles armature spring astronomical axis azimuth Bamberg transit binding posts Cancri chronograph pen chronograph sheet chronometer clock corrections Coast and Geodetic computation connected control knobs coupling coil dead point determined difference duo-lateral winding feet field station filament rheostat fixed condensers footplate front contact galvanometer gin pole Greenwich mean grid circuit grid potential guard flap guy lines inches incoming signal inductance coil instrument insulated latitude lead-in lightning switch line of collimation mechanical lag meter micrometer head micrometer screw ocular oscillations pen magnet plate circuit potentiometer radio recorder radio signal radio time signals regenerative circuit relay armature right ascension setting circle shown in Figure shunt side sidereal Special Publication storage battery strongly sewed telescope tent tion transit micrometer tuned circuit turn U. S. Naval Observatory United States Naval vacuum tubes variable capacity Washington wave length west pier WIRELESS LONGITUDE zenith