I found the image on FMP as Angela suggested. I was also wondering what Bow St Bd meant and I "think" it relates to the school which was the Central school on Leopold Street
"The school was extended between 1894 and 1899 with a building on Bow Street (no longer a road) to form an infants school with a roof-top playground".
I used to walk on Leopold St every day for 6 yrs as I worked close to there in the early sixties. The only school I remember was the Sheffield Technical School or something like that.