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Slating for Black-Boards

The imitations of slate are of two kinds, real imitations, consisting of pulverized slate or from one to the other; this is a token of the quartz rock moistened to the consistency of a galvanic current, manifesting itself in the thick fluid with silicate of soda (water-glass of same manner as the current of the electrical commerce), and applied to the boards by machine. The larger the disks and the means of a brush; or merely paints, such as greater their number, the greater is the intenasphaltum or Grahamite dissolved in petro- sity of the current. leum naphtha. The first one will produce 6358. To Make a Cistern. A good slates that are very similar to the natural cistern can be made in a solid clay soil, if slates, less expensive than those, and last a good while. not in an exposed situation, by cementing against the sides of the ground. Where the