https://archive.org/details/standardletterin00claf/page/42/m...
> I don’t know how this first proto-Gorton was designed – unfortunately, Taylor, Taylor & Hobson’s history seems sparse and despite personal travels to U.K. archives, I haven’t found anything interesting – but I know simple technical writing standards existed already, and likely influenced the appearance of the newfangled routing font.
The author's comparison of the fonts actually argues against them being of the claimed lineage. Consider the many differences between the Taylor, Taylor & Hobson machine’s fonts and the Gorton machine’s fonts. If Gorton had a license to use the Hobson machine designs, which they did, they could have simply copied the TT&H fonts verbatim. But they clearly did not. Why not? I think it's likely that they simply preferred a different design, one closer to the letterforms that were more commonly used by draftsmen in the American market. In other words, the Gorton reference design was not the TT&H font design.
At least, that's my best guess based on the evidence presented.
> Each of these reappearances made small changes to the shapes of some letters. Leroy’s ampersand was a departure from Gorton’s. Others softened the middle of the digit 3, and Wrico got rid of its distinctive shape altogether. Sometimes the tail of the Q got straightened, the other times K cleaned up. Punctuation – commas, quotes, question marks – was almost always redone. But even without hunting down the proof confirming the purchase of a Gorton’s pantograph or a Leroy template set as a starting point, the lineage of its lines was obvious. (The remixes riffed off of Gorton Condensed or the normal, squareish edition… and at times both. The extended version – not that popular to begin with – was often skipped.)
While these standards date from around 1930, they were based on much older lettering textbooks. The oldest that I have seen was from 1871, and these German textbooks did not differ much from the American textbooks quoted above.