To write quickly and easily and erase in a one-step process. It shows a slate of 7 lines with 14 cells. Each spring-loaded dot can be pressed and released causing it to raise then pressed and released again causing it to lower. The action is similar to that of a ballpoint pen. It consists of 10 lines of 16 cells.
Writing is done on one half and pins appear on the other half oriented for reading.
It has 1 line of 10 cells. It consists of a line of large pegs which can be pressed as if writing on a slate. When the slate is turned over, the pegs are raised in reading orientation. Additional Features A variety of additional features have been added to slates to enhance their functionality by making them easier and more efficient to use or to facilitate learning. This pocket slate was manufactured by the Deutsche Blindenstudienanstalt, Marburg and has 27 lines of 30 cells.