Moxon's mechanick exercises, volume 1 (of 2) : $b The doctrine of handy-works applied to the art of printingMoxon, Joseph
History
Moxon's mechanick exercises, volume 1 (of 2) : $b The doctrine of handy-works applied to the art of printing
Moxon, Joseph
Printing -- Early works to 1800
It is confirm’d upon good consideration and Reason as well as constant
experience, that in a whole Revolution of the _Spindle_, in the _Nut_,
the _Toe_ does and ought to come down two Inches and an half; but the
_Spindle_ in work seldom makes above one quarter of a Revolution at
one _Pull_, in which sweep it comes down but half an Inch and half a
quarter of an Inch; and the reason to be given for this coming down, is
the squeezing of the several parts in the _Press_, subject to squeeze
between the Mortesses of the _Winter_ and the Mortesses the _Head_
works in; and every Joynt between these are subject to squeeze by the
force of a _Pull_. As first, The _Winter_ may squeeze down into its
Mortess one third part of the thickness of a _Scabbord_. (Allowing a
_Scabbord_ to be half a _Nomparel_ thick.) Secondly, The _Ribs_ squeeze
closer to the _Winter_ one _Scabbord_. Thirdly, The _Iron-Ribs_ to
the Wooden _Ribs_ one _Scabbord_. Fourthly, The _Cramp-Irons_ to the
_Planck_ of the _Coffin_ one _Scabbord_. Fifthly, The _Planck_ it self
half a _Scabbord_. Sixthly, The _Stone_ to the _Planck_ one _Scabbord_.
Seventhly, The _Form_ to the _Stone_ half a _Scabbord_. Eighthly, The
_Justifyers_ in the Mortess of the _Head_ three _Scabbords_. Ninthly,
The _Nut_ in the _Head_ one _Scabbord_. Tenthly, The _Paper_, _Tympans_
and _Blankets_ two _Scabbords_. Eleventhly, Play for the Irons of the
_Tympans_ four _Scabbords_. Altogether make fifteen _Scabbords_ and one
third part of a _Scabbord_ thick, which (as aforesaid) by allowing two
_Scabbords_ to make a _Nomparel_, and as I shewed in _Vol._ 2. _Numb._
2. §. 2. One hundred and fifty _Nomparels_ to make one Foot, gives
twelve and an half _Nomparels_ for an Inch, and consequently twenty
five _Scabbords_ for an Inch; so by proportion, fifteen _Scabbords_ and
one third part of a _Scabbord_, gives five eighth parts of an Inch, and
a very small matter more, which is just so much as the _Toe_ of the
_Spindle_ comes down in a quarter of a Revolution.
This is the Reason that the coming down of the _Toe_ ought to be just
thus much; for should it be less, the natural Spring that all these
Joynts have, when they are unsqueez’d, would mount the Irons of the
_Tympans_ so high, that it would be troublesom and tedious for the
_Press-man_ to _Run_ them under the _Plattin_, unless the _Cheeks_
stood wider assunder, and consequently every sweep of the _Bar_ in a
_Pull_ exceed a quarter of a Revolution, which would be both laborious
for the _Press-man_, and would hinder his usual riddance of Work.
Public-domain text, read in full here on John Shaqi.
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