It is generally observed by _Work-men_ as a Rule, That when they _Cast Quadrats_ they _Cast_ them exactly to the Thickness of a set Number of m’s or _Body_, _viz._ two m’s thick, three m’s thick, four m’s thick, _&c._ And therefore the _Stops_ aforesaid must all be filed exactly to their several intended thicknesses, The reason is, that when the _Compositer_ Indents any Number of Lines, he may have _Quadrats_ so exactly _Cast_ that he shall not need to _Justifie_ them either with _Spaces_ or other helps. ¶. 2. _Some Rules and Circumstances to be observed in_ Casting. 1. If the Letter be a small _Body_, it requires a Harder _Shake_ than a great _Body_ does: Or if it be a thin Letter though of a greater _Body_, especially small _i_, being a thin Letter its Tittle will hardly _Come_; So that sometimes the _Caster_ is forced to put a little _Block-Tin_ into his Mettal, which makes the Mettal Thinner, and consequently have a freer flux to the _Face_ of the _Matrice_. 2. He often examines the _Registers_ of the _Mold_, by often _Rubbing_ a _Cast_ Letter: For notwithstanding the _Registers_ were carefully _Justified_ before, and hard screwed up; yet the constant thrusting of both _Registers_ against the sides of the _Matrice_, may and often do force them more or less to drive backwards. Or a fall of one half or both Halfs of the _Mold_, may drive them backwards or forwards: Therefore he examins, as I said, how they _Rub_, whether too Thick or too Thin. And if he see Cause, mends the _Registers_, as I shew’d §. 5. ¶. 2. Or if the _Matrice_ be _Botcht_, as I shew’d you §. 5. ¶. 3. then those _Botches_ (being only so many fine points rising out of the Body of the _Copper_ of the _Matrice_) may with so many reiterated pressures of the _Registers_ against them, flatten more and more, and press towards the Body of the _Matrice_, and consequently make the Letter Thinner: Which if it do, this must be mended in the _Matrice_ by re-raising it to its due Thickness. 3. He pretty often examins, as I shew’d in §. 5. ¶. 2. how the Letters stand in _Line_: For when great Numbers are _Cast_ with one _Matrice_, partly by pressing the point of the _Wyer_ against the _Bottom-Sholder_ of the _Notch_ in the back-side of the _Matrice_, and partly by the softness of the matter of his _Matrice_ and hardness of the _Iron-stool_, the _Foot_ of the _Matrice_ (if it wear not) may batter so much as to put the Letter out of Line. This must be mended with a _Botch_, _viz._ by knocking up the _Foot_ of the _Matrice_, as I shew’d §. 5. ¶. 3. A Workman will _Cast_ about four thousand of these Letters ordinarily in one day. ¶. 3. _Of_ Breaking _off_ Letters.