score:27
The first book google hit for "cablegram price" is The Bolsheviks: Twilight of the Romanov Dynasty by John D. Loscher which contains a discussion of the prices and comparison to today's money. If I understand it correctly, it is one shilling a word and "five letters in conjunction counted as one word". One shilling (1/20 of pound sterling) was $3.11 of "American money" at the time of writing (published 2009). So a fifteen word cablegram from England to America was worth $46.65 in "today's money".
According to this commerce report from 1915 the minimum charge for week-end messages from Australia to USA 12s2d ($2.94) for 19 words. Deferred cablegrams cost 1s2d (28 cents) per word and full-rate messages 2s4d (57 cents) per word. Note that s is a shilling and d is a penny. This citation agree with the rate in the first quote which was for 1914.
A thorough discussion of various pricing options is available in Cable Services by Bill Glover (link by Pieter Geerkens). It will explain what deferred and weekend, as well as other types of telegrams and the associated rates mean. They appeared just before the first world war. For example, the weekend telegram
a minimum of 20 or 25 words paid for and in plain language. This telegram would only be delivered (posted) on the Monday following the day it was handed in.
while the deferred telegram
A minimum of five words must be paid for, they must be in plain language and in the language of the country of origin or destination or of a language specified by the relevant telegraph company.
This link also affirms the rate as 1s0d per word. A reduction to 9d came in 1923 because of competition from wireless.
Further discussion of the evolution of the pricing agreements is available in The cost of a telegram: the evolution of the international regulation of the telegraph regulation of the telegraph by Alan J. Richardson (link also by courtesy of Pieter Geerkens). But I did not find the actual numbers for transatlantic cable messages there.
Upvote:6
Partial answer.
Source for information would be postal agreements of the Universal Postal Union, where rates and conditions were set for international fees.
Telegrams fees were often based on a combination of local, (possible) transit and end country fees, which changed with time.
The rates are given in gold (French) francs (FF)
In Germany the minimum was 10 words (or a base fee plus a word fee).
1 word had a maximum of 15 letters.
So finding a postal agreement valid 1914 should give you the needed information to work out a realistic cost.
Sources:
Upvote:6
Partial answer.
Here are the telegram rates from Austria in 1913, found on page 226 of Józef Czech's Krakow Calendar for 1913 (the rates in the 1914 edition are the same), expressed in Austro–Hungarian hellers (1/100 of a krone) for telegrams 3–30 words long and for each subsequent word. The telegram form cost 2 hellers. According to a table on page 223, 1 US dollar was worth 4.96 Austro–Hungarian kronen.
However, there are no trans-Atlantic rates in the table, whose columns read:
[