Telegraph relays amplify an electrical signal in a telegraph line. Telegraph messages travel as a series of electrical pulses through a wire from a transmitter to a receiver. The pulses fade in strength as they travel through the wire, limiting the distance a message can be sent. Relays remedy that problem by detecting a weak signal and automatically re-transmitting that signal down the line using a local power source.
Telegraph relays amplify an electrical signal in a telegraph line. Telegraph messages travel as a series of electrical pulses through a wire from a transmitter to a receiver. The pulses fade in strength as they travel through the wire, limiting the distance a message can be sent. Relays remedy that problem by detecting a weak signal and automatically re-transmitting that signal down the line using a local power source.
Telegraph relays amplify an electrical signal in a telegraph line. Telegraph messages travel as a series of electrical pulses through a wire from a transmitter to a receiver. The pulses fade in strength as they travel through the wire, limiting the distance a message can be sent. Relays remedy that problem by detecting a weak signal and automatically re-transmitting that signal down the line using a local power source.
Cylindrical housing containing a small electric motor mounted in the center near the bottom. A wire mesh screen covers the bottom and is attached to the bottom of the motor-cover. A two-conductor cord emerges from the side of the housing thru a grommet and extends 69”. An unpolarized two-prong plug is mounted on the end of the cord. Cord appears to be original. A stamped metal-disc is seated inside the housing and encircles the motor. When the unit operates, this disc does not spin - it simply vibrates in place. Six (roughly rectangular) holes are stamped in the disc. The cut-outs on three are still attached and have been bent downward at a 90 degree angle creating leg-like structures which agitate the flour. Object purchased in a Savage, MD. antique shop in 1998.
Marked on box: Master-Craft / Tube / Renewer / Will Rejuvenate / any type of Radio / Tubes on the bat- / teries of your set. / Makes / Old Tubes / Like New / Price: $1.00 / One Old Tube / Renewed Pays For it. / Master-Craft Products Co. / 3803 N. Clark St., Chicago." Unit is a small energizer for vacuum tubes of the 199 or 201A type. A high voltage is placed across the filament of the tube resulting in a greater thorium coating being deposited on the filament surface. Includes original box and instruction sheet. Reference: Instruction leaflet furnished with unit.
Marked on plate: "Jefferson No. 280 / Radio Tube Charger / [directions] / Jefferson Electric Mfg. Co. / Chicago, USA"; on unit: "110 volts 50-133 cycles." A radio tube filament activator for thorium type tubes. A standard 201-A socket is mounted on a metal frame with a slot arrangement permitting high or low voltages to be placed across the filament pins.
Marked: "American Electric Chicago"; label on top reads: "Burns / Made in / U.S.A." A commercial loud speaker driver, using the magnetic headphone principle. Two binding posts on side of metal can flanking a threaded attach point. A hex nut on a bolt that emerges from the back holds the unit together. Brass sleeve to connect to speaker horn. Unit mounts horizontally on a base (missing) rather than being built into the base or serving as the base.
Marked: "Type 593 / A-B Relay / for Sets With / Five or More 3-Volt tubes / Made in USA by / Jewell Electrical Instrument Co., Chicago." Directions on nameplate. Relay for connection between a trickle charger and a "B" eliminator. "A" terminal connections are made to binding posts on unit. Stone frame with bakelite paneling. Plug missing form line cord.
Marked: box: "Carter / Socket / Resistor / For Reducing Excess / Filament Voltage / on 227 type tubes. / Lengthens Life / of tubes. / Carter Radio Co. / Chicago." and "No. 227". Standard 5-pin tube socket for 227 type tubes, with a separate socket resistor for reducing filament voltage. Resistor has double carbon element with two binding posts. This is one set containing two parts in original box. Retail price on box: $1.25.
Marked: "Wood's / Radio / Re-Juv-A-Tube / (UV201A & UV199 Type) / For use on Thorium Filament tubes / Clark Annis Mfg. Co. / 2540-48 / So. Wabash Avenue, Chicago". Specimen is a device employed to reactivate thoriated tungsten filaments in 199 and 201-A type vacuum tubes. A high voltage is applied to the filament for 20 seconds with the panel switch in the #1 position, and normal voltages are applied for 4 minutes with the switch in the #2 position. Six tube sockets are provided on the panel. A note on the partially torn instruction label states: "Charge 25 [cents] a tube if tube is OK when thru."
Marked on plate: "Jefferson Tube Rejuvenator / 100-120 volts / 50-133 cycles / [directions] / Jefferson Electric Mfg. Co. / Chicago, Illinois." Unit is designed to reactivate tube filaments of UV-199 or UV-201A type triodes. Socket mountings for both type tubes are provided on panel of unit. Two switches are each marked H and L for high and low voltage, and are designed to be thrown into the high voltage position for 45 seconds, then to the low position for 10 minutes. Original price: $14.55. Reference: Clymer-Greenwood, page 212.
Marked: "OROTROL / Oro-Tone Co. / Chicago" and "Brilliant - Deep" control settings. A knurled knob varies setting from "Brilliant" to "deep". This unit is an early tone control for a broadcast receiver. Terminal lugs attached to the end of cord.
