A low-speed communications device that transmits up to approximately 150 bps. Telegraph grade lines, stemming from the days of Morse code, cannot transmit a voice conversation. In 1843, the U.S. Congress authorized $30,000 to build a telegraph line between Baltimore and Washington, DC. The wire was strung onto 700 poles which were placed approximately 300 feet apart. On May 24, 1844, at the U.S. Supreme Court in Washington, Samuel Morse tapped out "What hath God wrought" via telegraph to his assistant Alfred Vail who was waiting at a Baltimore railroad station, some 40 miles away.
The Days of the Morse Code
Data was transmitted at about four to six bits per second in the latter half of the 1800s, which was as fast as a human hand could tap out Morse code. The unit on the right is the telegraph key. A metal bar on the receiver (left) simply banged against another bar when the current passed through, creating a clicking sound.
The Days of the Morse Code
Data was transmitted at about four to six bits per second in the latter half of the 1800s, which was as fast as a human hand could tap out Morse code. The unit on the right is the telegraph key. A metal bar on the receiver (left) simply banged against another bar when the current passed through, creating a clicking sound.
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2008 The Computer Language Company Inc. All rights reserved. |
Additional Resources
- Fastest-growing business and finance sites in the UK in September 2008
- Property Aug-2008 Sep-2008 % Change Total U.K. Internet Audience 35,608 35,980 1% Business/Finance - news/research 8,011 8,843 10% Guardian Business 155 374 141% Sky Money 52 116 122% CNN Money 68 138 103% Bloomberg.com 126 201 60% ...
- Blog posts 2008-11-30
- 'Fish' = 'Sex'? iPhone can't understand British accent
- The new voice-recognition search tool for the iPhone has problems understanding British accents, leading to some bizarre answers to spoken queries, according to a report by Agence France Presse. The free application, which allows iPhone owners to use the Google search engine with their voice, mistook the...
- Blog posts 2008-11-19
- Yahoo: Pondering Yang's replacement; The next move
- Now that Yahoo CEO Jerry Yang is out, the handicapping begins. Who will be Yang's replacement and what will that choice reveal about Yahoo's future? The story line Techmeme revolving around Yang's departure is familiar. Yang took over the company at the second worst time in Yahoo's...
- Blog posts 2008-11-18
- Nokia working to reduce traffic congestion
- I had a nice chat with Ross Lamont from Nokia this morning regarding the Nokia Legends campaign my interview should be in the next MobileTechRoundup podcast and he mentioned that their Mobile Millenium project talked about on the Nokia Telegraph "virtual paper" was moving forward with a larger scale testing...
- Blog posts 2008-11-12
- 10 candidates who could become Obama's CTO
- 10 candidates who could become Obama's CTOHow about John McCain?:-)RE: 10 candidates who could become Obama's CTOPersonally, I think Gates would be the best choice. He is a visionary. Had his vision years ago, managed to podge together ideas and technology from other sources, and create the Windows empire.The only...
- Discussion threads 2008-11-10
- No longer safe: WPA encryption cracked in 12 to 15 minutes
- No longer safe: WPA encryption cracked in 12 to 15 minutesI've said it before, I'll say it again...Wireless and Retail do not mix!http://talkback.zdnet.com/5208-12691-0.html?forumID=1&threadID=45392&messageID=838312&start=-9957WPA is not cracked - only TKIP is, no access to data..Here is why :- Attack does not give you access to the data transmited- Why? Only the...
- Discussion threads 2008-11-06
- Show of hands: Who wants multi-touch on a PC (and why)?
- Show of hands: Who wants multi-touch on a PC and why?Touch HandheldsMulti Touch is really for handhelds. I wouldn't want to use my notebook or a media center pc using touch. I'd rather use a remote for a media center pc and a mouse with my notebook. I don't know...
- Discussion threads 2008-11-04
- A tough decision: Grab an iPhone or wait for the Storm?
- Verizon Wireless and Research in Motion should be thanking one particular customer service rep for stopping at least one customer - me - from defecting to AT&T and the iPhone this week. I had called in to find out about altering my existing family plan and porting my phone over...
- Blog posts 2008-10-30
- News to know: Clickjacking redux; SAP pricing; BlackBerry Storm; Windows 7
- Here are today's notable headlines. You can get News To Know via email alert and RSS daily: Ryan Naraine: Webcam hijack demo highlights clickjacking threat Dancho Danchev: Atrivo/Intercage's disconnection briefly disrupts spam levels Adobe posts workaround for clickjacking flaw, NoScript releases ClearClick ...
- Blog posts 2008-10-08
- Many UK teachers support creationism
- After Royal Society education director Michael Reiss was forced out of his position over comments that creationism could be taught in science class, a new survey find more than a quarter of British teachers agree, The Telegraph reports. In a survey by Southampton...
- Blog posts 2008-09-19
- Did McCain invent the BlackBerry?
- Did John McCain invent the BlackBerry? Well, no one actually said he did, although the Telegraph headlined a story as such. As the LA Times reports the episode, here's what happened: Asked by reporters today about McCain's grasp of technological issues, senior policy...
- Blog posts 2008-09-16
- Stephen Hawking: LHC vital, absolutely safe
- Note: Replaced still from Hawking on Star Trek with this clip -- so much fun Since the geniuses at CERN have failed to assuage amped-up if entirely unfounded fears that the Large Hadron Collider is actually a doomsday machine, they have reached up to the mountain to...
- Blog posts 2008-09-09
- Bid to stop Large Hadron Collider fails but EU, US suits move forward
- The Large Hadron Collider -- designed to replicate conditions in the universe immediately after the Big Bang and due to be switched on in 10 days -- is being challenged by a last-minute lawsuit at the European Court for Human Rights. Opponents of...
- Blog posts 2008-09-02
- What's on Obama's iPod?
- On 15 August I posted a piece about what's on Michael Phelps' iPod (spoiler: lots of hip hop). Over the weekend I came across a piece in thew September issue of Macworld magazine about What's on Obama's iPod. The story which quotes The Examiner article offline says...
- Blog posts 2008-09-02
- Passports worth £2.5 million stolen in van hijack
- Graham Tibbetts of the UK Telegraph is reporting that the British Foreign Office has admitted to losing around 3,000 passports and visa stickers, which were stolen on their way from Manchester to RAF Northolt in London, where they were to be sent to British embassies. From the article: Officials...
- Blog posts 2008-07-29
- Big Brother Getting Bigger Part 2: United Kingdom
- In a move to bring direct competition to the US on who can be the bigger, badder, more blatant Big Brother, the United Kingdom has apparently decided to create a database holding the telephone numbers and email accounts of everyone in Britain. The details of every phone conversation, SMS, and...
- Blog posts 2008-07-16
- '.wow': ICANN to allow almost any domain suffix
- '.wow': ICANN to allow almost any domain suffixDangerous ground[i]However, Twomey told Agence France-Press that the organization will still try to block or reject any domain name that it deems inappropriate for security or [b]moral[/b] reasons.[/i]And just what morality standards will they be using?Personally, It wouldn't bother me if all porn...
- Discussion threads 2008-06-27
- Security researchers hack the London underground train for free ride
- A group of Dutch security researchers were able to clone the "smartcards" that commuters use to pay fares in the London Underground system, allowing the group to ride for free. This is an interesting attack vector that I actually talked to Adam Laurie about when I was at Black Hat Amsterdam. ...
- Blog posts 2008-06-26
- Top UK online newspapers in March 2008
- Property Audience, 000 Pages Viewed, mln. UK Internet Audience 33,761 107,287 Newspapers 14,823 448 The Sun Online 4,268 131 GUARDIAN.CO.UK 3,619 44 Telegraph Group Ltd 2,754 20 Times Online 2,600 21 DAILYMAIL.CO.UK 2,466 40 ...
- Blog posts 2008-06-14
- Mac OS 10.6 to be Intel only?
- Mac OS 10.6 to be Intel only?64-bit is the future64-bit is the future anyway so no problem with releasing a 64-bit only OS. It might seem painful but it's good given that it's just going to pave a way for people to switch from 32-bit to 64-bit as if the...
- Discussion threads 2008-06-04
Neighboring Terms
Premier Vendor Content Whitepapers, webcasts & resources from our Power Center Sponsors
- Video Podcast: Evaluating 2- and 4-Socket Server Virtualization Platforms
-
In this video we hear from Sudip Chahal, Principal Engineer with the Intel IT Enterprise Architecture Group, talking about a new white paper from IT@Intel, "Evaluating Two- and Four-Socket Server Virtualization Platforms."
- See how different servers would perform in a variety of virtualization scenarios >>
