The manual alphabet seems to be a popular topic.
John Bulwer published a book about the “natural language of the hand”, illustrated with typical handshapes but believed signs were universal (however he did recognize sign language as an efficient mode of communication)
Both Bulwer and a scholar (George Dalgarno) had already published versions of fingerspelling before Wallis. Additionally, two-handed manual alphabet similar to Dalgarno’s eventually became a standard resource in BSL.
John Bulwer published a book about the “natural language of the hand”, illustrated with typical handshapes but believed signs were universal (however he did recognize sign language as an efficient mode of communication)
Both Bulwer and a scholar (George Dalgarno) had already published versions of fingerspelling before Wallis. Additionally, two-handed manual alphabet similar to Dalgarno’s eventually became a standard resource in BSL.