This section is from the book "The New Cyclopaedia of Domestic Economy, and Practical Housekeeper", by Elizabeth Fries Ellet. Also available from Amazon: The New Cyclopaedia of Domestic Economy, and Practical Housekeeper.
The salmon, like cod, must be quite fresh or it will not crimp. Cut the body into slices about two inches thick; have ready some salt and water in the proportion of three ounces of salt to a quart of water, with the smallest knob of salt-petre about the size of a nut; dip the salmon slices into this as they are cut, hold them for half a minute, and then rinse them in clear cold spring water, and lay them upon a dish; put a lump of butter well rubbed in flour into a stewpan; while the butter is melting sprinkle in a little salt and cayenne, and when the butter is on the simmer stir in half a pint of cream, keep stirring, and as it boils squeeze in the juice of a quarter of a lemon, and stir in a large teaspoonful of essence of anchovies; add a little more salt to taste.
Having boiled the crimped salmon slices in quick boiling water ten minutes, take them out and let them drain one minute, put them in a clean stewpan, and pour over the prepared cream and let it simmer ten minutes; it should not if possible be suffered to boil.
The lemon juice is sometimes deferred until the fish is removed from the cream, a minute's simmer is allowed, and it is then all poured over the salmon and sent very hot to table.
 
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