Wood-working tools; how to use them. A manual by Industrial School Association Boston

Author:Industrial School Association, Boston
Language: eng
Format: epub, pdf
Tags: Woodwork (Manual training)
Publisher: Boston, Ginn & Heath, for the Industrial School Association
Published: 1881-03-25T05:00:00+00:00

Fig. VII, a. MARKING OFF DISTANCES.

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Fig. VII, />.

CHALKING THE LINE.

loop in the line, and press it into the wood at one of the given points. Chalk the line. Then stretch it figh/ly, covering the other given point with it. If convenient to do so, stand at the end of the board, with the right foot advanced toward it. With the /eft thumb press the line against the board near its end, and with the fingers of the left hand draio the line tight. (See Fig. VII, c.) Shut one eye and place the other directly over the line. Grasp the line, at a point which is about a foot distant from the left thumb, between the tips of the forefinger and thumb of the right hand. Rest the little finger of the right hand upon the board to steady the hand. (See Fig. VII, d.) Keep the surface of contact of the thumb and forefinger vertical and also parallel to the line. (See Fig. VII, ^.) Raise the cord vertically with the right hand. Sight lengthwise of the line. If it appears straight when seen from a point directly over it, it will have been raised vertically. Let go the line. On removing it, a straight chalk-mark will be found, on the board, joining the given points.

Second method. If it is more convenient to stand at the side of the board, use the left hand, and the eyes, as before. Grasp the line between the right forefinger and thumb, with the right palm down, and with the backs of the fingers to the front. Keep the surface of contact of the thumb and forefinger vertical and parallel to both straight portions of the line. Snap the line, as before.

Ex. VII, 4. — To Join two given points of a horizontal board, by a crooked chalk-mark. Stretch the chalked line between the given points, as in Ex. VII, 3. Carry the line to the left, or to the right, of the vertical while raising it. If it appears, from a point direcdy over its original position, to be bent at the right thumb and finger, it has been carried to the right or left of the vertical. Let go the line. On removing it, a crooked chalk-mark will be found upon the board. Ex. VII, 5. — To Join two given points of a board by aid

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