Open the razor, so that the handle is in line with the blade. Grasp it firmly with the right hand, the first two fingers and thumb holding the razor just back of the heel, so that perfect control is had of both the blade and handle. With the razor held in this manner it is an easy matter to turn the razor back and forth from one side to the other.
Lay the blade flat on the further end of the strop, as shown in Fig. E, with the edge away from you. Draw the blade toward you, always keeping the heel of the razor in advance of the point. When at the end of the strop, rotate the razor on its back till the un-stropped side of the blade comes in contact with the strop, as shown in Fig. F. Then, with the heel in advance, push the razor away from you, until it reaches the further end of the strop. Again rotate, and continue the stropping until the razor is sharp.
Always hold the blade at the same angle, and perfectly flat on the strop. You will observe that the stroke is exactly opposite to that used in honing. In honing, the edge is in advance; in stropping, the back. During the operation the back of the razor should never be taken from the strop. By observing this, and always turning the blade on its back, instead of on the edge, you will avoid cutting the strop.
Beginners should not attempt to make a quick stroke. Let the stroke be slow and even, developing speed gradually until a complete mastery of the movement is acquired.
If the razor is in good condition and not in need of honing, fifteen or twenty strokes in each direction will be sufficient. If, however, the razor should require honing, no amount of stropping will put a keen edge on it. It will usually be necessary to strop the razor each time you shave, and with stiff beards more than once may be required. (Thanks to gutenberg project for this excerpt)