Baudot code

In the below table, Columns I, II, III, IV, and V show the code; the Let. and Fig. columns show the letters and numbers for the Continental and UK versions; and the sort keys present the table in the order: alphabetical, Gray and UK {|class="wikitable collapsible sortable" style="border:none" |+Baudot code (Continental and UK versions) |- !scope="col" colspan="7" | Europe !scope="col" colspan="2" |sort keys !scope="col" colspan="8" | UK !scope="col" | sort keys |- ! scope="col" class="unsortable"| V ! scope="col" width="10" class="unsortable"| IV ! scope="col" width="25" colspan=2 class="unsortable"| ! scope="col" width="10" class="unsortable"| I ! scope="col" width="10" class="unsortable"| II ! scope="col" width="10" class="unsortable"| III ! scope="col" width="15" | Con­ti­nen­tal ! scope="col" width="15" | Gray ! scope="col" width="15" class="unsortable"| Let. ! scope="col" width="15" class="unsortable" | Fig. ! scope="col" width="15" class="unsortable" | V ! scope="col" width="15" class="unsortable" | IV ! scope="col" width="0" class="unsortable" | ! scope="col" width="15" class="unsortable" | I ! scope="col" width="15" class="unsortable" | II ! scope="col" width="15" class="unsortable" | III ! scope="col" width="15" | UK |- | || || || || || || || data-sort-value="32" | - || data-sort-value="000"|- || || || || |||| || || ||data-sort-value="08"|- |- | || || A || 1 || ● || || || data-sort-value="01" | || data-sort-value="001"| || A || 1 || || |||| ● || || ||data-sort-value="01"| |- | || || É || & || ● || ● || || data-sort-value="06" | || data-sort-value="002"| || / || ¹/|| || |||| ● || ● || ||data-sort-value="04"| |- | || || E || 2 || || ● || || data-sort-value="05" | || data-sort-value="003"| || E || 2 || || |||| || ● || ||data-sort-value="02"| |- | || || I || || || ● || ● || data-sort-value="10" | || data-sort-value="004"| || I || ³/|| || |||| || ● || ● ||data-sort-value="05"| |- | || || O || 5 || ● || ● || ● || data-sort-value="16" | || data-sort-value="005"| || O || 5 || || |||| ● || ● || ● ||data-sort-value="07"| |- | || || U || 4 || ● || || ● || data-sort-value="22" | || data-sort-value="006"| || U || 4 || || |||| ● || || ● ||data-sort-value="06"| |- | || || Y || 3 || || || ● || data-sort-value="26" | || data-sort-value="007"| || Y || 3 || || |||| || || ● ||data-sort-value="03"| |- | || ● || B || 8 || || || ● || data-sort-value="02" | || data-sort-value="010"| || B || 8 || || ● |||| || || ● ||data-sort-value="11"| |- | || ● || C || 9 || ● || || ● || data-sort-value="03" | || data-sort-value="011"| || C || 9 || || ● |||| ● || || ● ||data-sort-value="14"| |- | || ● || D || 0 || ● || ● || ● || data-sort-value="04" | || data-sort-value="012"| || D || 0 || || ● |||| ● || ● || ● ||data-sort-value="15"| |- | || ● || F || || || ● || ● || data-sort-value="07"| || data-sort-value="013"| || F || ⁵/|| || ● |||| || ● || ● ||data-sort-value="13"| |-collapsed | || ● || G || 7 || || ● || || data-sort-value="08" | || data-sort-value="014"| || G || 7 || || ● |||| || ● || ||data-sort-value="10"| |- | || ● || H || || ● || ● || || data-sort-value="09" | || data-sort-value="015" | || H || ¹ || || ● |||| ● || ● || ||data-sort-value="12"| |- | || ● || J || 6 || ● || || || data-sort-value="11" | || data-sort-value="016 " | || J || 6 || || ● |||| ● || || ||data-sort-value="09"| |- | || ● || ''Figure'' || ''Blank'' || || || ||data-sort-value="30" | || data-sort-value="017" | || ''Fig.'' || ''Bl.'' || || ● |||| || || ||data-sort-value="16"| |- | ● || ● || ''Erasure'' || ''Erasure'' || || || ||data-sort-value="29" | || data-sort-value="020" | || * || * || ● || ● |||| || || ||data-sort-value="32"| |- | ● || ● || K || ( || ● || || || data-sort-value="12" | || data-sort-value="021" | || K || ( || ● || ● |||| ● || || ||data-sort-value="25"| |- | ● || ● || L || = || ● || ● || || data-sort-value="13" | || data-sort-value="022" | || L || = || ● || ● |||| ● || ● || ||data-sort-value="28"| |- | ● || ● || M || ) || || ● || || data-sort-value="14" | || data-sort-value="023" | || M || ) || ● || ● |||| || ● || ||data-sort-value="26"| |- | ● || ● || N || N°|| || ● || ● || data-sort-value="15" | || data-sort-value="024" | || N || £ || ● || ● |||| || ● || ● ||data-sort-value="29 "| |- | ● || ● || P || % || ● || ● || ● || data-sort-value="17" | || data-sort-value="025" | || P || + || ● || ● |||| ● || ● || ● ||data-sort-value="31"| |- | ● || ● || Q || / || ● || || ● || data-sort-value="18" | || data-sort-value="026" | || Q || / || ● || ● |||| ● || || ● ||data-sort-value="30"| |- | ● || ● || R || – || || || ● || data-sort-value="19" | || data-sort-value="027" | || R || – || ● || ● |||| || || ● ||data-sort-value="27"| |- | ● || || S || ; || || || ● || data-sort-value="20" | || data-sort-value="030" | || S || ⁷/|| ● || |||| || || ● ||data-sort-value="19"| |- | ● || || T || ! || ● || || ● || data-sort-value="21" | || data-sort-value="031" | || T || ² || ● || |||| ● || || ● ||data-sort-value="22"| |- | ● || || V || ' || ● || ● || ● || data-sort-value="23" | || data-sort-value="032" | || V || ¹ || ● || |||| ● || ● || ● ||data-sort-value="23"| |- | ● || || W || ? || || ● || ● || data-sort-value="24" | || data-sort-value="033" | || W || ? || ● || |||| || ● || ● ||data-sort-value="21"| |- | ● || || X ||, || || ● || || data-sort-value="25" | || data-sort-value="034" | || X || ⁹/|| ● || |||| || ● || ||data-sort-value="18"| |- | ● || || Z || : || ● || ● || || data-sort-value="27" | || data-sort-value="035" | || Z || : || ● || |||| ● || ● || ||data-sort-value="20"| |- | ● || || || . || ● || || || data-sort-value="28" | || data-sort-value="036" | || – || . || ● || |||| ● || || ||data-sort-value="17"| |- | ● || || ''Blank'' ||''Letter'' || || || ||data-sort-value="31" | || data-sort-value="037" | || ''Bl.''|| ''Let.'' || ● || |||| || || ||data-sort-value="24"| |}

Baudot developed his first multiplexed telegraph in 1872 and patented it in 1874. In 1876, he changed from a six-bit code to a five-bit code, as suggested by Carl Friedrich Gauss and Wilhelm Weber in 1834, with equal on and off intervals, which allowed for transmission of the Roman alphabet, and included punctuation and control signals. The code itself was not patented (only the machine) because French patent law does not allow concepts to be patented.

Baudot's 5-bit code was adapted to be sent from a manual keyboard, and no teleprinter equipment was ever constructed that used it in its original form. The code was entered on a keyboard which had just five piano-type keys and was operated using two fingers of the left hand and three fingers of the right hand. Once the keys had been pressed, they were locked down until mechanical contacts in a distributor unit passed over the sector connected to that particular keyboard, at which time the keyboard was unlocked ready for the next character to be entered, with an audible click (known as the "cadence signal") to warn the operator. Operators had to maintain a steady rhythm, and the usual speed of operation was 30 words per minute.

The table "shows the allocation of the Baudot code which was employed in the British Post Office for continental and inland services. A number of characters in the continental code are replaced by fractionals in the inland code. Code elements 1, 2 and 3 are transmitted by keys 1, 2 and 3, and these are operated by the first three fingers of the right hand. Code elements 4 and 5 are transmitted by keys 4 and 5, and these are operated by the first two fingers of the left hand."

Baudot's code became known as the International Telegraph Alphabet No. 1 (ITA1). It is no longer used. Provided by Wikipedia