This section is from the book "Soyer's Standard Cookery", by Nicolas Soyer. Also available from Amazon: Soyer's Standard Cookery.
Four cups of sugar, two cups of water, whites of six eggs, half teaspoonful of tartaric acid.
Boil sugar and water until syrup when dropped from tip of spoon forms a long thread. Pour syrup gradually on beaten whites of egg, beating constantly; then add acid and continue beating. When stiff enough to spread, put a thin coating over cake. Beat remaining frosting until cold and stiff enough to keep in shape after being forced through a pastry tube. After first coating on cake has hardened, cover with a thicker layer, and crease for cutting. If frosting is too stiff to spread smoothly, thin with a few drops of water. With a pastry bag and variety of tubes, cake may be ornamented as desired.
Whites of six eggs, two tablespoonfuls of lemon juice, confectioners' sugar, sifted.
Put eggs in a large bowl, add two tablespoonfuls of sugar, and beat three minutes, using a perforated wooden spoon. Repeat until one and one-half cups of sugar are used. Add lemon juice gradually, as mixture thickens. Continue adding sugar by spoonfuls, and beating until frosting is stiff enough to spread. This may be determined by taking up some of mixture on back of spoon, and with a case knife making a cut through mixture; if knife makes a clean cut and frosting remains parted, it is of right consistency. Spread cake thinly with frosting; when this has hardened, put on a thicker layer, having mixture somewhat stiffer than first coating, and then crease for cutting. To remaining frosting add enough more sugar, that frosting may keep in shape after being forced through a pastry bag and tube.
With a pastry bag and variety of tubes, cake may be ornamented as desired.
 
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