The letters run from A through to E, five letters. But there are six drawings including the top, which is numbered 5, and not F. Note my red lines which align the separate parts of each drawing, there are five. Could he be telling us - yet again, that there are five mechanisms?
There is also the curious attachment of the two rods or levers at the top of the figure B. It must be important otherwise he wouldn’t have included it. Does it show two extremes of an action of one lever, or does it represent two levers?
I don’t think that there is any intention to suggestion that A is meant to indicate a Jacob’s ladder.
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