The Bletchley Park Codebreakers (2014) - Plot & Excerpts
at the 11th space, the next is 7 spaces after that, i.e. at the 18th space, and so on in arithmetical progression until the 9th blank, placed at the 81st space, is reached. It will be found that this is in the row of the grid, i.e. halfway down.The grid is now turned upside down and the same procedure followed as above, so that the blanks are symmetrical.The message to be coded is now written in the grid, ignoring the blanks, that is to say, no letter must be written in a blank space. The blanks are then filled in with any letter which can be chosen quite arbitrarily.At the top of the grid, the word CONGRATULATIONS is filled in, and underneath this each letter is numbered in order of the alphabet. Thus, A is 1, the second A is 2, C is 3, G is 4, and so on, until each column of the grid is numbered.The procedure for sending out the message is as follows:A line should be drawn at the end of the message when written out in the grid to separate it from the unused portion of the grid.Each column (downwards) of letters is then written out, the order depending on the date on which the message is being sent.
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