A Historical Account of Useful Inventions and Scientific Discoveries: Being a manual of instruction and entertainment.Grant, George
History
A Historical Account of Useful Inventions and Scientific Discoveries: Being a manual of instruction and entertainment.
Grant, George
Inventions -- History
Notwithstanding none can feel a higher respect for Professor Beckmann,
to whom we are indebted for many of the preceding observations, than we
do, yet strongly as we are influenced with this impression, we cannot
help observing, consistent with that duty we owe to the public, that we
cannot divest ourselves of the opinion that he is only trifling with
the public feeling, perhaps for the ostentatious display of his own
learning: so many objections of so little weight are raised, that he
really appears to write for the purpose of raising new objections to
passages, which, in our comprehension, are extremely simple. We cannot
help applying to him a passage which occurs in a song of the Swan of
Twickenham, who sings:--
“Gnawed his pen, then dashed it on the ground,
Striking from thought to thought, a vast profound.
Plunged for the sense, but found no bottom there,
Yet wrote, and floundered on in mere despair.”
We would not be illiberal or capricious, nor do we presume to any extra
portion of intelligence; yet, we think we can in a few words discuss
the topic, and perhaps, satisfactorily, on which he has employed so
many pages. Those terms which have troubled the professor with learned
difficulties really appear to us susceptible of an easy interpretation,
and applicable to both or either of the senses in which they are
used, as are any words in the language of ancient Rome. Accordingly,
we find the term _creta_ implies either chalk, fuller’s clay, loam,
white paint, or Asiatic earth, termed creta Asiatica; and, in brief it
appears a mere generic name for any kind of earth, raised from below
the surface of the soil: this is its true sense. But there cannot be a
question, from what is known of the preparation of clay and earth for
_terra cotta_ and other plastic purposes, which undergo a variety of
washings, kneadings, &c., that similar preparations were requisite,
in order to bring it to so curious, so delicate a purpose as that to
which the terra sagillaris was applied. And _fosse_, in the sense used
by Varre, admits of nearly a similar description, it appearing as a
pronomen for the same thing; and indicates either peat, marl, loam,
chalk, or any earthy substance which may be raised from below the
terrestrial surface.
We have evidence every day in our fruit shops, that in certain
countries this kind of earth is yet employed for closing up jars of
dried fruits brought from Oporto, Smyrna, and other countries; as these
appear to be composed of white chalk of a texture somewhat similar to
common mortar. The warmth of the atmosphere, where it is used, soon
hardens and prevents the passage of air to the contents; the jars
themselves being oftentimes only dried in the sun.
Thus it appears that prepared earths were first used for the purpose
of sealing; their adhesive, or, as Virgil has it, their tenacious
qualities, being wonderfully improved for manual labour. Next, paste
was employed, prepared from dough.
Public-domain text, read in full here on John Shaqi.
Reviews
Reviews
No reviews yet
Be the first to share your thoughts on this work.
Elsewhere in the archive
Join the Discussion
Join the discussion
Sign in to leave a comment or review.
Sign InorCreate an account