The 1909 Dōbun shinjiten 同文新字典 @ https://t.co/rvCeMEI6h0 seen in the tweet refers to Izawa Shūji 伊沢修二 (視話応用清国官話韻鏡字音解説 @ https://t.co/c72NnZmngc) for their transcriptions of Chinese pronunciation. Here are some specimens of that system. https://t.co/2X5brJPl3i https://t.co/Cm7GbW37ME