But besides _Letters_, there is to be _Cast_ for a perfect _Fount_ (properly a Fund) _Spaces_ Thick and Thin, n _Quadrats_, m _Quadrats_ and _Quadrats_. These are not _Cast_ with _Matrices_ but with _Stops_ (as we may call them) Because when these are _Cast_ they are all shorter than the _Shanck_ of the Letter, that they may not _Print_. Therefore they take off the _Register_ of the under-Half _Mold_, and fit a piece of _Plate-Brass_ about a _Brevier_ Thick and a _Brevier_ longer than to reach to the edge of the _Body_ in the place of the _Register_, and drill a hole in this _Plate-Brass_ right against the Hole in the _Carriage_ that the _Female-Screw_ lies in: This Hole is made so wide that the _Male-Screw_ which screwed the _Register_ close to the _Carriage_ and _Body_ may enter in at it, and screw this _Plate-Brass_ close to them, as it did the _Register_: Then they make a mark with the point of a _Needle_ on the _Plate-Brass_ just against the side of the Edge of the _Body_, and at this mark they double down the end of the _Plate-Brass_ inwards to make a perfect _Square_ with the _inside_ of the whole _Plate_. This doubling down is called the _Stop_ aforesaid, and must be made just so thick as they design the Thin or Thick _Space_ to be, and must have its Upper and Under-Edges filed so exactly to the _Body_, that it may lie close upon the Under-_Carriage_, and just even so high as the upper-side of the _Body_. So that when the Upper half of the _Mold_ is placed on the under-Half, and _Mettal Cast_ in at the _Mouth_ (as before) the _Mettal_ shall descend no deeper between the two _Bodies_ then just to his _Stop_: You must note that this _Stop_ must be filed exactly true as to _Body_ and _Thickness_: For if it be never so little too big in _Body_, the _Carriage_ of the _Mold_ will ride upon it and make the _Body_ of the _Space_ bigger. Or if the _Body_ be never so little too little, the Hot _Mettal_ will run beyond the _Stop_; both which Miscarriages in making the _Stop_, spoil the _Space_. If the _Space_ be too short, they File the end of the _Stop_ shorter. This _Brevier_ thick _Plate_ will be thick enough for _Stops_ for the Thin or Thick _Spaces_ of any Body though of _Great-Cannon_, and for the n _Quadrat Stop_ of any Body under a _Great-Primmer_. And for the m _Quadrat Stop_ of all to a _Brevier_ and all Bodies under it. But for _Stops_ that require to be Thicker then a _Brevier_, instead of doubling the _Stop_ inwards on the _Plate_, I _Solder_ on the inside of that end of the _Plate_ a _Stop_ full big enough in Body, and big enough in Thickness for the _Quadrat_ I intend to make, and afterwards file and fit the _Stop_ exactly as before. When they _Cast_ these _Spaces_ or _Quadrats_, this _Stop_ is always screwed fast upon the _Carriage_ of the under-Half _Mold_ as aforesaid. So that they only fit the upper half _Mold_ on the under, and _Cast_ their Number almost twice as quick as they do the Letters in _Matrices_.