The Sparks Telegraph Key Review Informational and photo display site on telegraph keys. Extensive information about instruments used during the spark-era of radio. By Russ Kleinmann, WA5Y.
The Telegraph An assortment of telegraph instrument images compiled from several early physics apparatus collections by Professor Thomas Greenslade Jr. of Kenyon College.
The Telegraph Office A resource for wire and wireless telegraph instrument collectors and historians. Several images of instruments are viewable in the photo galleries.
The Vibroplex Collector's Page Extensive information about identifying and dating Vibroplex Bugs. (Semi-automatic telegraph keys used by telegraphers and radio operators to send Morse code.)
W1TP Telegraph & Scientific Instrument Museums The Telegraph Museum on this site contains hundreds of images of American and foreign telegraph instruments from different eras. Presented by Tom Perera, W1TP.