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You can read it here
A wonderful little booklet, ca. 1930, from The Western Union Telegraph Company.
THE composition of a well-worded, concise and pertinent telegram may easily be a matter of some small difficulty. It is therefore hoped that the conventional telegrams on the following pages may be found useful to our patrons in suggesting to them forms appropriate to the various occasions for which they are designed. They are naturally suggestions only, to be changed and modified according to the personal taste of the individual. The longer forms can be sent most cheaply as Night Letters or Day Letters. A NIGHT LETTER of fifty words, for instance, can be sent for the cost of a ten-word full rate message; i.e., from 24 cents to $1.20, according to the distance. There is no limit to the length of a Night Letter; just remember that you can always send five times as many words as in a full-rate telegram, and at the same cost. A DAY LETTER of fifty words, for instance, can be sent for one and one-half times the cost of a ten-word full rate message; i.e., from 36 cents to $1.80, according to the distance. There is no limit to the length of a Day Letter. The rates for Cable Letters and Cable Week-End Letters can be obtained by inquiry at any of our offices. Rates are surprisingly reasonable; for instance, a 20-word Week-End Letter can be sent from New York City to London for $1.00; only 5 cents a word.
THE WESTERN UNION TELEGRAPH COMPANY
To read more click here to have a look inside.
Just came across this little booklet on “How to Write Telegrams Properly.” A small book of just 30 pages published in 1928, start off “The extraordinary expansion of the telegraph companies of the United States during the last two decades and the constantly increasing volume of their traffic are proof that the American people are utilizing the telegraph today as never before in history.” To think less then a hundred years ago this was the fastest method of communication.
If you are so inclined you can read “How to Write Telegrams Properly,” in pdf format here.