Trading via telegraph is more than old time, it's olde tyme. To facilitate a more accurate way of receiving orders and relaying information, the Robinson Telegraphic Cipher was created in 1872 (a few years before invention of the telephone) to have a standardized listing of telegraphic communication at the Chicago Board of Trade. The following pages are scanned from the 1897 edition of the cipher and to be honest I don't know when it ceased to be published. Although I'll highlight a few scans, fortunately the entire book is scanned by google books so it can be seen here. Basically the premise of the cipher was for the telegraph operators to translate a certain word into a phrase, number, word, etc... to abbreviate it in an accurate and standardized manner. (Click on photos to enlarge)
If anyone wants one, the cipher can be found in various booksellers on the internet for around $30 on up so it's not too rare.