This section is from the book "The London Art Of Cookery and Domestic Housekeepers' Complete Assistant", by John Farley. Also available from Amazon: The London Art of Cookery.
When you have properly picked your turkey, break the leg-bone close to the foot, and draw out the strings from the thigh, for which purpose you must put it on a hook fastened against the wall. Cut off the neck close to the back ; but be careful to leave the orop skin sufficiently long to turn over to the back. Then proceed to take out the crop, and loosen the liver and gut at the throat end with your middle finger. Then cut off the vent, and take out the gut. With a crooked sharp-pointed iron pull out the gizzard, and the liver will soon follow. Be careful, however, not to break the gall. With a wet cloth wipe out the inside perfectly clean. With a large knife cut the breast-bone through on each side close to the back, and draw the legs close to the crop. Then put a cloth on the breast, and beat the high bone down with a rolling-pin till it lies flat. If the turkey is to be trussed for boiling cut the legs off; then put your middle finger into the inside, raise the skin of the legs, and put them under the apron of the turkey. Put a skewer in the joint of the wing and the middle joint of the leg, and run it through the body and the other leg and wing. The liver and gizzard must be put in the pinions; but take care first to open the gizzard, and take out the filth and the gall of the liver. Then turn the small end of the pinion on the back, and tie a packthread over the ends of the legs to keep them in their places. If the turkey is to be roasted, leave the legs on, put a skewer in the joint of the wing, tuck the legs close up, and put the skewer through the middle of the leg and body. On the other side put another skewer in at the small part of the leg. Put it close on the outside of the sidesman, and put the skewer through, and the same on the other side. Put the liver and gizzard between the pinions, and turn the point of the pinion on the back. Then put, close above the pinions, another skewer through the body of the turkey.
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Turkey polts must be trussed in the following manner: Take the neck from the head and body, but do not remove the neek skin. They are drawn in the same manner as a turkey. Put a skewer through the joint of the pinion, tuck the legs close, run the skewer through the middle of the leg, through the body, and so on the other side. Cut off the under part of the bill, twist the skin of the neck round, and put the head on the point of the skewer, with the bill end forwards. Another skewer must be put in the sidesman, and the legs placed between the sidesman and apron on each side. Pass the skewer through all, and cut off the toe-nails. It is very common to lard them on the breast. The liver and gizzard may or may not be used, as you like.
 
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