Answer:
A strange thing, at first sight, is that the experiments made show
that it is possible to cut fairly sharply a sheet of paper with a pair of
scissors, even though the blade is blunted and quite defectively mounted
on the axis.
With a pair of scissors which has very marked "play" at the level
of the pivot, rather satisfactory results can be obtained by using, in
holding the scissors, a certain well known ruse or device, namely, the
thumb on one side and the third or fourth finger on the other side,
inserted into the rings of the scissors, impressing upon the blades a
torsion movement of one against the other transversely. This move-
ment finally becomes somewhat automatic since one has to have re-
course to it quite often because of the poor condition of the scissors
used.
So far as the notches on the edge of one blade or the other are
concerned, one would be tempted to believe that the slightest notch
in the blade would manifest itself in an irregularity in the section
of paper. To the contrary, however, it is observed in practice that
the sectioned paper shows the irregularities of the blade quite imper-
fectly. Certain notches on the cutting edges of the instrument may be
clearly visible to the eye and especially and markedly perceptible to the
finger-nail run along the length of the blade, whereas on the sectioned
paper their effects will be scarcely visible. This, it appears, is due
to the fact that paper is a rather poor plastic substance. In order
for the notches and irregularities in the blades to be inscribed on the
section of paper, it is necessary for them to be of noticeable size.
Explanation:
sana po makatulong
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Answers & Comments
Answer:
A strange thing, at first sight, is that the experiments made show
that it is possible to cut fairly sharply a sheet of paper with a pair of
scissors, even though the blade is blunted and quite defectively mounted
on the axis.
With a pair of scissors which has very marked "play" at the level
of the pivot, rather satisfactory results can be obtained by using, in
holding the scissors, a certain well known ruse or device, namely, the
thumb on one side and the third or fourth finger on the other side,
inserted into the rings of the scissors, impressing upon the blades a
torsion movement of one against the other transversely. This move-
ment finally becomes somewhat automatic since one has to have re-
course to it quite often because of the poor condition of the scissors
used.
So far as the notches on the edge of one blade or the other are
concerned, one would be tempted to believe that the slightest notch
in the blade would manifest itself in an irregularity in the section
of paper. To the contrary, however, it is observed in practice that
the sectioned paper shows the irregularities of the blade quite imper-
fectly. Certain notches on the cutting edges of the instrument may be
clearly visible to the eye and especially and markedly perceptible to the
finger-nail run along the length of the blade, whereas on the sectioned
paper their effects will be scarcely visible. This, it appears, is due
to the fact that paper is a rather poor plastic substance. In order
for the notches and irregularities in the blades to be inscribed on the
section of paper, it is necessary for them to be of noticeable size.
Explanation:
sana po makatulong
Answer:
The most common defect in scissors is the looseness in their pivot. Gradually the rivet forming the pivot becomes worn, loosens, and the two blades have free play one upon the other.