I

Litharge.......... 3 ounces

Fine white sand ... 3 ounces Plaster of Paris.... 3 ounces Rosin, in fine powder............. 1 ounce

Linseed oil, enough. Drier, enough.

Mix the first three ingredients, add sufficient linseed oil to make a homogeneous paste, and then add a small quantity of drier. This should stand a few hours before it is used. It is said that glass joined to iron with this cement will break before it will come loose.

II

Litharge.......... 1 ounce

Fine white sand.... 1 ounce Plaster of Paris.... 1 ounce Manganese borate. 20 grains Rosin, in fine powder............. 3.5 pounds

Linseed varnish oil, enough.

III

Take equal parts of flowers of sulphur, ammonium chloride, and iron filings, and mix thoroughly with boiled linseed oil. Finally, add enough white lead to form a thin paste.

IV

Powdered graphite.     6 parts

Slaked lime.......     3 parts

Barium sulphate...     8 parts

Linseed varnish oil.     7 parts

V

Simply mix equal parts of white and red lead with a little kettle-boiled linseed oil.