drawing a spiral
1. Describe the necessary "equipment" (start of the process)
...a "test kit"... :
- a plastic bottle cap (from a water or fruit-juice bottle)
with a slit cut in the edge,
- about 1 foot of heavy thread or light string,
- a sharpened pencil, and
- a large sheet of paper on which to practice drawing spirals
with the assembled kit.
... construct the
spiral-drawing device from the parts provided and ...
1. ...a short vertical slit in the edge of the
plastic bottle cap (Fig. 1, left).
2. ... a knot in one end of the thread ... ... shown in
Fig. 1, right.
3. ...the sharpened end of the pencil into ...
(Fig. 1, right).
4. ... the other end of the thread into the
slit in the bottle cap... (Fig. 1, left).
5. ...the bottle cap (with thread and
pencil attached)...
(Fig. 2).
6. ...the thread around the rim of the bottle
cap, as in Fig. 2, until ...
7. ... the spiral (Fig. 3):
(a) ...the bottle cap with one hand.
(b) ...the thread slowly, using the
pencil tip ...
8. ... the bottle cap and pencil...
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