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In "The Petition of the Master Taylors of London and its Vicinity, December 1800" (reproduced in Galton, 1896), it is stated
the wages and allowances ... were accordingly settled at the rate of 18/9 per week ...
the wages the journeymen now receive is 25/ per week ...
have refused to work unless their respective masters will raise the wages they now receive to 30/ per week
I'm guessing that "18/9" means 18s9d, while "25/" and "30/" mean 25s and 30s?
Yes your guess is correct.
In fact, the forward slash punctuation mark "/" actually comes to us through its being the abbreviation for the English shilling.
From Humez and Humez (2008):
... forward slash (/), which is also variously known as a solidus, virgule, or just plain slash, when the deletion of a single character is to be marked. The solidus was a Roman coin and is ultimately the basis for English soldier, the idea being that a soldier is someone who fights for money, or, as we might say today, a mercenary (from the Latin merces ‘wages.’) The solidus as slash is historically a straightened-out S, the abbreviation for the English shilling (as in 2/3—two shillings thruppence), the step from one coin to another being relatively easy. How we get from shilling to slash in its various other uses—as proofreader’s strike-out mark, arithmetical sign of division, general separatrix, and so on—is rather more murky.
