Ten historical telegraph instruments. A thematic selection, not a ranking of speed or communication reliability. Licensed photographs. File:Morse's telegraph station, 1931 - Morse's telegraph devices introduced in Serbia in 1855.jpg: Milica Buha; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Morse%27s_telegraph_station,_1931_-_Morse%27s_telegraph_devices_introduced_in_Serbia_in_1855.jpg; Scaled and letterboxed without cropping. File:Morse key-CNAM 14674-2-IMG 5195-white.jpg: Rama; CC BY-SA 3.0 fr; https://creativecommons.org/licenses/by-sa/3.0/fr/deed.en; https://commons.wikimedia.org/wiki/File:Morse_key-CNAM_14674-2-IMG_5195-white.jpg; Scaled and letterboxed without cropping. File:Vintage J.H. Bunnell & Co., 150 Ohms Telegraph Sounder (8936528984).jpg: Joe Haupt from USA; CC BY-SA 2.0; https://creativecommons.org/licenses/by-sa/2.0; https://commons.wikimedia.org/wiki/File:Vintage_J.H._Bunnell_%26_Co.,_150_Ohms_Telegraph_Sounder_(8936528984).jpg; Scaled and letterboxed without cropping. File:Hughes printing telegraph, 1860. (9663805708).jpg: Science Museum London / Science and Society Picture Library; CC BY-SA 2.0; https://creativecommons.org/licenses/by-sa/2.0; https://commons.wikimedia.org/wiki/File:Hughes_printing_telegraph,_1860._(9663805708).jpg; Scaled and letterboxed without cropping. File:Winnitsa-Heimatmuseum Baudot-Telegraph Geisler-StPetersburg 20260702 33cr.jpg: photo User:Zenwort; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Winnitsa-Heimatmuseum_Baudot-Telegraph_Geisler-StPetersburg_20260702_33cr.jpg; Scaled and letterboxed without cropping. File:GWR Cooke and Wheatstone double needle telegraph instrument.jpg: Geof Sheppard; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:GWR_Cooke_and_Wheatstone_double_needle_telegraph_instrument.jpg; Scaled and letterboxed without cropping. File:Zeigertelegraf Siemens denis apel cc.jpg: Denis Apel; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Zeigertelegraf_Siemens_denis_apel_cc.jpg; Scaled and letterboxed without cropping. File:Breguet telegraph 1844.jpg: (c) 2006 Zubro; CC BY-SA 3.0; http://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:Breguet_telegraph_1844.jpg; Scaled and letterboxed without cropping. File:Teleprinter Creed 7 with cover on in Telegraph Museum, Taiping.jpg: Cerevisae; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Teleprinter_Creed_7_with_cover_on_in_Telegraph_Museum,_Taiping.jpg; Scaled and letterboxed without cropping. File:Teletype Model 33 ASR (1968) (14689737122).png: Dennis van Zuijlekom from Ermelo, The Netherlands; CC BY-SA 2.0; https://creativecommons.org/licenses/by-sa/2.0; https://commons.wikimedia.org/wiki/File:Teletype_Model_33_ASR_(1968)_(14689737122).png; Scaled and letterboxed without cropping. Adaptation: CC BY-SA 4.0. Original photographs retain their stated licenses. https://creativecommons.org/licenses/by-sa/4.0/