DOI Page / Citation link:
https://doi.org/10.11588/diglit.68888#0055
M I C R O G R A P H 1 At,
appear the brighter.throw towards the eye a multitude of small reflexi-
ons of light, whereas the darker scarce asford any. The reafon of which
resseXion, the Microfcepe plainly discovers, as appears by the Figure. In
which you may perceive, that the brighter parts of the furface consist of
an abundance of large and strong resseXions,denoted by ay ay ay ay &c*
for the surfaces of those threads that run the long wayy are by the Mecha-
nical process of watering, creas d or angled in another kind of posture
then they were by the weaving: for by the weaving they are onely bent
round the warping threads 5 but by the watering, they are bent with an
angle, or elbowy that is instead of lying, or beingTent round the threads,
as in the third Figure, ay ay ay a^ ay are about b^bj? (bybyb reprelenting the
ends,as ’twere,of the cross threads,they are bent about) they are creas’d
on the top of thole threads, with an angle., as in the fourth Figure, and
that with all imaginable variety 5 so that,whereas before they resseXed
the light onely from one point of the round surface, as about c, c, d, they
now when water’d, resseX the beams from more then half the whole sur-
face,as de^deydey and in other postures they return no refleXions at all
from those sursaces. Hence in one posture they compole the brighter
parts of the waves,in another the darker. And these resseXions arealso
varied, according as the particular parts are varioully bent. The reason
of which creasing we Dial 1 next examine 5 and here wemust fetch our in-
formation from the Mechanism or manner of proceeding in this operation 5
which, as I have been inform’d, is no other then this.
They double all the Stufs that is to be water’d, that is,they creaso it just
through the middle of it, the whole length of the piece, leaving the right
(ide of the Stuff inward, and placing the two edges, or silvages just upon
one another,and,as near as they can,place the wale so in the doubling of it,
that the wale of the one side may lie very near parallel, or even with the
wale of the other 5 for the nearer that posture they lie, the greater will
the wateringappear 5 and the more obliquely,or across to each other they
lie, the Imaller are the waves. Their way for folding it for a great wale
is thus: they take a Pin,and begin at one side of the piece in any wale,and
so moving it towards the other side, thereby direX their hands to the op-
posite ends of the wale, and then, as near as they can, place the two op-
posite ends of thejame wale together, and so double, or fold the whole
piece, repeating this enquiry with a Pin at every yard or two’s distance
through the whole length 5 then they sprinkle it with water,and fold it the
longways, placing between every fold a piece of Pastboard, by which
means all the wrong side of the water’d Stuff becomes ssat, and with little
wales, and the wales on the other side become the more protuberant j
whence the creasings or angular bendings of the wales become the more
perlpicuous. Having folded it in this manner,they place it with an inter-
jacent Pastboard into an hot Press, where it is kept very violently prest,
till it be dry and stiff; by which means, the wales of either contiguous
lides leave their own impressions upon each other, as is Very mani-
fest by the second Figure, where ’tis obvious enough, that the wale of the
piece A B C D runs parallel between the pricked lines es, es> ef> and as
£> manifest
0
appear the brighter.throw towards the eye a multitude of small reflexi-
ons of light, whereas the darker scarce asford any. The reafon of which
resseXion, the Microfcepe plainly discovers, as appears by the Figure. In
which you may perceive, that the brighter parts of the furface consist of
an abundance of large and strong resseXions,denoted by ay ay ay ay &c*
for the surfaces of those threads that run the long wayy are by the Mecha-
nical process of watering, creas d or angled in another kind of posture
then they were by the weaving: for by the weaving they are onely bent
round the warping threads 5 but by the watering, they are bent with an
angle, or elbowy that is instead of lying, or beingTent round the threads,
as in the third Figure, ay ay ay a^ ay are about b^bj? (bybyb reprelenting the
ends,as ’twere,of the cross threads,they are bent about) they are creas’d
on the top of thole threads, with an angle., as in the fourth Figure, and
that with all imaginable variety 5 so that,whereas before they resseXed
the light onely from one point of the round surface, as about c, c, d, they
now when water’d, resseX the beams from more then half the whole sur-
face,as de^deydey and in other postures they return no refleXions at all
from those sursaces. Hence in one posture they compole the brighter
parts of the waves,in another the darker. And these resseXions arealso
varied, according as the particular parts are varioully bent. The reason
of which creasing we Dial 1 next examine 5 and here wemust fetch our in-
formation from the Mechanism or manner of proceeding in this operation 5
which, as I have been inform’d, is no other then this.
They double all the Stufs that is to be water’d, that is,they creaso it just
through the middle of it, the whole length of the piece, leaving the right
(ide of the Stuff inward, and placing the two edges, or silvages just upon
one another,and,as near as they can,place the wale so in the doubling of it,
that the wale of the one side may lie very near parallel, or even with the
wale of the other 5 for the nearer that posture they lie, the greater will
the wateringappear 5 and the more obliquely,or across to each other they
lie, the Imaller are the waves. Their way for folding it for a great wale
is thus: they take a Pin,and begin at one side of the piece in any wale,and
so moving it towards the other side, thereby direX their hands to the op-
posite ends of the wale, and then, as near as they can, place the two op-
posite ends of thejame wale together, and so double, or fold the whole
piece, repeating this enquiry with a Pin at every yard or two’s distance
through the whole length 5 then they sprinkle it with water,and fold it the
longways, placing between every fold a piece of Pastboard, by which
means all the wrong side of the water’d Stuff becomes ssat, and with little
wales, and the wales on the other side become the more protuberant j
whence the creasings or angular bendings of the wales become the more
perlpicuous. Having folded it in this manner,they place it with an inter-
jacent Pastboard into an hot Press, where it is kept very violently prest,
till it be dry and stiff; by which means, the wales of either contiguous
lides leave their own impressions upon each other, as is Very mani-
fest by the second Figure, where ’tis obvious enough, that the wale of the
piece A B C D runs parallel between the pricked lines es, es> ef> and as
£> manifest
0