I set the ngram viewer to show the incidence of the words "laſt" and "last" in all English documents (including British and American) from 1700 to 1900. I actually entered the words "laft" (with a small-F) and "last" because Google's OCR technology misread the long-s as an "f". This has been corrected by Google since the creation of this picture, so to be able to make a distinction between the two kinds of "s", one has to select one of the 2009 corpora.
The ngram viewer allows the user to examine a sample of documents that were referenced by the search with the target words highlighted. I saw that the apparent minor peaks of short-s usage during 1700-1800 were largely not due to actual short-s usage, but due to the occasional use of a different OCR technology that was able to recognize the long-s as an "s" rather than an "f". This was particularly noticeable when the ngram viewer was set to look at American documents only, which gave unusably uneven curves from 1700-1800, partly because there are not enough American documents from that period to form smooth curves, and because of the usage of the better OCR on about one-third of the American documents from that period.
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{{Information |Description={{en|1=Historical usage of long s}} |Source={{own}} |Author=Farry |Date=2010-12-18 |Permission= |other_versions= }} Category:Long s