I told you in §. 11. ¶. 4. that the Angle the _Sholder_ made with the _Face_ of the _Letter_, is about 100 Degrees, which is 10 Degrees more then a _right Angle_ or _Square_. So that if a _Letter_ be _Cast_ and _Rub’d_ just so thick that the _Liner_ when applied to the _Shanck_ of the _Letter_ reaches just to the _Sholder_, there will be an _Angle_ of 10 Degrees, contained between the edge of the _Liner_ and the _Straight Line_ that proceeds from the _Sholder_ at the _Shanck_, to the outer-edge of the _Face_ of the _Letter_. And if two _Letters_ be thus _Cast_ and _Rub’d_ and _Set_ together, the _Angle_ contained between their _Shancks_, and the outer-edge of the _Face_ of the _Letter_ will be 20 Degrees, which is too wide by half for the _Faces_ of two _Letters_ to stand assunder. Therefore the sides of the _Matrice_ must be so _Justified_, that when the _Shancks_ of two _Letters_ stand close together, the _Angle_ between both the _Shancks_, and the adjacent outer-edges of the _Faces_ of the _Letters_ may both make an _Angle_ of about 10 Degrees as aforesaid, which is a convenient distance for two _Letters_ to stand assunder at the _Face_. But to do which, If the right-side be too thick, the _Register_ of the under-half of the _Mold_, being (as I said) hard screw’d, so as to stand about an n off the edge of the _Body_ towards the right hand; He places the _Foot_ of the _Matrice_ on the _Stool_, and the right-side of the _Matrice_ close against the _Register_, and observes how much too thick that side of the _Matrice_ is: For so much as the right-hand edge of the _Orifice_ of the _Matrice_ stands on the left-hand side of the _Body_, so much is the Right-side of the _Matrice_ too thick, and must by several offers be _Filed_ away with a _Bastard-Cut-File_, not all at once, least (ere he be aware) he makes that side of the _Matrice_ too thin, which will be a great dammage to the _Matrice_, and cannot be mended but with a _Botch_, as shall in proper place be shewed. Having by several proffers wrought the right-side of the _Matrice_ thus near its thickness, he proceeds to _Justifie_ the left-side also. But this side must be _Justified_ by the upper half of the _Mold_; By turning the top of the _Matrice_ downwards, and placing the left-side of it (now the right-side) against the _Register_, and works away the left-side in all respects as he did the right-side; still being very cautious he takes not to much _Copper_ away at once.