This section is from the book "Elements Of Construction", by Charles A. King. Also available from Amazon: Elements of construction.
The Correct Position. (A.) In using planes, or any edge tools, a position should be taken which will furnish sufficient resistance to the pressure required for making the cut, as the pressure should be applied firmly and steadily. With experience, the correct position will be taken involuntarily; the beginner, however, should be continually upon the watch to overcome his awkwardness.
(B.) The habit of bending from the hips is acquired easily. The young workman should learn to work in as nearly an erect position as possible, for if the bending of the shoulders is persisted in, a permanent stoop will result. Stand facing the work and clear of the bench in order to prevent unnecessary wear of the clothing.
(C.) Do not allow the plane to drop over the end of the board at either the beginning or the end of the stroke, as indicated at A, B, Fig. 35. To prevent this, the hand should be kept upon that part of the plane which is upon the board; at the beginning of the stroke, the weight should be upon the front end of the plane, as in Fig. 36, and at the end of the stroke, upon the rear end, or upon the handle, as in Fig. 37. Begin and end each stroke with a lifting motion, instead of allowing the plane to drop as it leaves or enters the wood. The plane should be held firmly, not rigidly; do not allow it to jump; this is caused generally by an attempt to take a shaving heavier than the plane should cut, or, if the cap iron is fitted and adjusted properly, by a dull iron. A cutter will jump or chatter if it does not fit solidly against the frog. In drawing the plane back after making a stroke, carry it upon the toe, or upon one corner; do not drag it flat upon its face, as the iron is thereby dulled as much as when it is cutting, or possibly more.

Fig. 35. - Incorrect Use of the Jack Plane.

Fig. 36. - Beginning the Stroke with a Jack Plane.

Fig. 37. - Ending the Stroke with a Jack Plane.
(D.) Carry the plane parallel with the grain when it is possible, and take no more shavings off than is necessary to attain the desired results. The young workman should make a study of the grain and the peculiarities of the different kinds of lumber upon which he works, losing no opportunity to experiment upon and compare the qualities of every available wood.
(E.) In using edge tools of any kind, little is gained, and much is often lost, by working with dull tools; tools should be sharpened often and thoroughly. This is of the utmost importance, for even with the tools in the best possible order, it will require much care and skill to do good work.
 
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