Northampton, Lehigh and York counties contain the most productive slate quarries in the country, and in 1908 the value of their output was $3,902,958; the Northampton and Lehigh slate is the only kind in the United States used for school blackboards.
Slate is quarried chiefly in Piscataquis county, most of it being used for roofing, but some for blackboards; in 1907 the amount quarried in Maine was valued at $236,106.
When she felt the maps and blackboards she asked, "Do men go to school?"
Weekly specials and sweets are displayed on the blackboards.
If you aren't familiar with slate tiles, the image of a slate backsplash may be calling to mind classroom blackboards in black or green.
