Many of the early British telegraph instruments operated on what is called a Double Current Telegraph System.

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The US and most of the world used a Single Current system, where current flows only in one direction. A dot or dash is caused by current flowing through the relay, while a space is caused by the absence of a current.

However, in a Double Current system, current flows in one direction through the relays to produce dots and dashes, and flows in the opposite direction to produce spaces. This is accomplished through the use of a Polarized Relay.

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Double Current systems are more efficient and can handle higher data rates because the action of changing polarity on the line neutralizes the residual charge on the line when the key is opened. With Single Current systems, this residual charge takes time to dissipate, which limits how fast data can be sent.

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Below are some pictures of some interesting keys from Great Britain, including single & double current keys as well as radio keys. Many are stamped 'GPO', which stand for General Post Office.

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*NOTE: For pictures of British spark keys such as Marconi, please visit my Spark Keys Page. https://treecz.amebaownd.com/posts/22914318.

(Click on each thumbnail to view the full size image):

Early British Camelback Key Marked GPO 187	Another View of the Camelback Key	GPO Number Stamp	Another Early British Camelback Key of Similar Design to the GPO 187 Key
Stroh Double-Current Key, Patented 1868	Top View of the Stroh Key. The Lever Pivots Sideways to Change Between Send & Receive	6-Terminal Double Current Reversing Key by Warden & Co. (Varley Patent of 1858) Westminster, England	Another Varley Patent Key
Postal Key Made By Siemens Brothers & Co. Ca. 1880	Another View of the Siemens Brothers Key Showing the Name	Classic Style Double Current Key With Glass Cover	Double Current Key With Cover Removed
Another Double Current Key by H. White, 1917	White Key With Cover Removed	Early Double Current Key GPO Type 866	Walters Electrical Type 6K Double Paddle Key. Used for Double Current & Cable Telegraph
Double Paddle Key With Glass Cover in Place	Another Early Double Current Key	GPO Type 562	British Railway Block Bell & Key. Used for Sending Signals Between Switch Towers. These Sets were NOT used to Send Morse Code
Inside the Block Bell Instrument. These Instruments Were Used to Send Codes to Indicate the Status of Trains Occupying Different Sections of Track	Close-Up of the Signalling Bell. For More Information About Block Bell Instruments, Check Out My Page on Needle Telegraph & Block Signalling	Typical GPO Postal Key	Another View of the GPO Postal Key
GPO Type 2036	Practice Key by GH Steward, 1898	Another British Practice Key	Postal Key by Elliott Brothers
Another Postal Key, Maker Unknown	Postal Key Marked 'Patt 1056' (F9WT Collection)	Another PATT 1056 Key. This One is Made by Baird & Tatlock	Possibly British Key Marked 'Marshall Key'. Maker Unknown
Ediswan Key & Buzzer Set	Ediswan Set With Buzzer Cover Removed	Radio Key by A. Mason, Surrey England	Walters Electrical Model 18K Postal Key With Leaf Spring Pivot
Different Style Walters 18K With Send-Receive Switch	Another Walters Key	Different View of the Walters Key	2 Walters Electrical Keys
Walters Electrical Model 20K	Postal Style Key with Switch. Marked R.L. 7019	Postal Style Key by Charles Palmer	Close-up of the Palmer Name
Unknown British Postal Style Key	Morse Training Key by WG Pye & Co, Cambridge	Top View of the Pye Key	The Victory Key. Used for Code Practice. Post-WW1
Close-up of the Victory Key	Unusual Split Lever Key Possibly Made by Siemens, a German Company	Another View of the Split Lever Key	Split Frame Key by ATM
Top View of the ATM Key	Walters Electrical Postal Key With Slot for Bug Wedge	Another Postal Style Key by Walters Electrical	Close-Up of the Walters Nameplate
RAF Airplane Key With Winker Lamp (F9WT Collection)	Postal Key by Pye & Co.	Another Pye & Co Key	Unknown Key, Possibly for Wireless Use
Marconi Type PS-213a With Cover	Air Ministries RAF Type B Aircraft Key	Inside the Type B Key	Type B Key Nameplate

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