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CHAPTER VII.
THE PIER BASE.
§ i. In § in. of Chap. III., it was stated that when a wall had
to sustain an addition of vertical pressure, it was first fitted to
sustain it by some addition to its own thickness; but if the
pressure became very great, by being gathered up into Piers.
I must first make the reader understand what I mean by a
wall's being gathered up. Take a piece of tolerably thick
drawing-paper, or thin Bristol board, five or six inches square.
Set it on its edge on the table, and put a small octavo book
on the edge or top of it, and it will bend instantly. Tear it
into four strips all across, and roll up each strip tightly. Set
these rolls on end on the table, and they will carry the small
octavo perfectly well. Now the thickness or substance of the
paper employed to carry the weight is exactly the same as it
was before, only it is differently arranged, that is to say,
" gathered up." * If therefore a wall be gathered up like the
Bristol board, it will bear greater weight than it would if it
remained a wall veil. The sticks into which you gather it are
called Piers. A pier is a coagulated wall.
§ ii. Now you cannot quite treat the wall as you did the
Bristol board, and twist it up at once; but let us see how you
can treat it. Let a, Fig. IX., be the plan of a wall which you
* The experiment is not quite fair in this rude fashion; for the small
rolls owe their increase of strength much more to their tubular form than
their aggregation of material; but if the paper be cut up into small strips,
and tied together firmly in three or four compact bundles, it will exhibit
increase of strength enough to show the principle. Vide, however, Appendix 16, " Strength of Shafts."
| Title | The stones of Venice - 1 |
| Creator | Ruskin, John |
| Publisher | J. Wiley |
| Place of Publication | New York |
| Date | 1889 |
| Language | eng |
| Type | Books/Pamphlets |
| Title | 00000094 |
| Type | Books/Pamphlets |
| Transcript | CHAPTER VII. THE PIER BASE. § i. In § in. of Chap. III., it was stated that when a wall had to sustain an addition of vertical pressure, it was first fitted to sustain it by some addition to its own thickness; but if the pressure became very great, by being gathered up into Piers. I must first make the reader understand what I mean by a wall's being gathered up. Take a piece of tolerably thick drawing-paper, or thin Bristol board, five or six inches square. Set it on its edge on the table, and put a small octavo book on the edge or top of it, and it will bend instantly. Tear it into four strips all across, and roll up each strip tightly. Set these rolls on end on the table, and they will carry the small octavo perfectly well. Now the thickness or substance of the paper employed to carry the weight is exactly the same as it was before, only it is differently arranged, that is to say, " gathered up." * If therefore a wall be gathered up like the Bristol board, it will bear greater weight than it would if it remained a wall veil. The sticks into which you gather it are called Piers. A pier is a coagulated wall. § ii. Now you cannot quite treat the wall as you did the Bristol board, and twist it up at once; but let us see how you can treat it. Let a, Fig. IX., be the plan of a wall which you * The experiment is not quite fair in this rude fashion; for the small rolls owe their increase of strength much more to their tubular form than their aggregation of material; but if the paper be cut up into small strips, and tied together firmly in three or four compact bundles, it will exhibit increase of strength enough to show the principle. Vide, however, Appendix 16, " Strength of Shafts." |
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