I have been making and using mechanical drawings since 1951 and I have NEVER seen a “drawing number” that includes a fraction! I could hardly believe my eyes when I open these drawing image files. I have tried to imagine the situation that existed in 1905 which led to the use of a fraction. The situation I came up with is the draftsman, for some reason, ran out of room  on the first sheet and needed a second sheet to accommodate the last view. The real mystery is the use of a fraction; why not use ‘sheet 2’? Any ideas?

I also realized the content of the two drawings suggested the placement of a steam turbine generator on the tender was at least contemplated; perhaps even tried. I have never heard of this before so I solicit any information that may be available on this subject.