The following are a few excerpts from the book by J. S. Rarey, "Horse-Taming by a New Method".

"In the first place fasten up the left fore-leg with strap No. 1 in such a manner that it will be permanently secured. The take a broad strap with a buckle or buckle frame at the end and pass it around the neck just back of the jaw-bone in the position given in the engraving. Draw the strap as tight as possible, so tight as to almost arrest the horse's breathing. The strap must not be buckled, but held in position to prevent slipping back. The animal will struggle for a few minutes, when he will become perfectly quiet, overpowered by a sense of suffocation; the veins in his head will swell; his eyes lose their fire; his knees totter and become weak; a slight vertigo will ensue and he will grow gradually exhausted. By now backing him around the stable, he will come down on his knees, in which position it is an easy matter to push him on his side, when his throat should be released."

"Another process of choking is described by the above engraving. After tying up your horse to the manger, make friends with him by some one of the coaxing processes heretofore given, and when you get him in thorough good humor with you, begin the choking by seizing him on the throat near the jaw, at the same time holding on to his mane with your left hand. When you have exhausted him sufficiently, let go the mane and rap him gently on the fore-legs until he lies down; or you may touch him with your foot instead. After he is down, rub him gently, speak kindly to him, and as soon as he is properly composed, fondle and caress him."

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Just in case you're unsure, theses are NOT good things to do!