How to Make Effervescing Solution of Citrate of Magnesia.--Dissolve
citric acid 400 grains in water 2,000 grains, add carbonate of
magnesia 200 grains; stir until dissolved. Filter into a 12-ounce
bottle containing syrup of citric acid 1,200 grains. Add boiled
and filtered water to fill bottle, drop in bicarbonate of potash in
crystals 30 grains and immediately cork. Shake until bicarbonate of
potash is dissolved. The syrup of citric acid is made from citric acid
8 parts, water 8 parts, spirit of lemon 4 parts, syrup 980 parts.
A Receipt for Making the Black Cement that is Used for Filling Letters
after They are Cut out in Brass.--Mix asphaltum, brown japan and
lampblack into a putty-like mass, fill in the spaces, and finally
clean the edges with turpentine.
Useful Workshop Hints.--Clean and oil leather belts without taking
them off their pulleys. If taken off they will shrink. Then a piece
must be put into them and removed again after the belt has run a few
days. The decay of stone, either in buildings or monuments, may be
arrested by heating and treating with paraffin mixed with a little
creosote. A common "paint burner" may be used to heat the stone. Set
an engine upon three or four movable points, as upon three cannon
balls. Connect with steam, and exhaust by means of rubber hose. If the
engine will run up to speed without moving itself back and forth,
then that engine will run a long time with little repair. If it shakes
itself around the room, then buy another engine.
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