I shew’d in _Numb._ 2. _fol._ 31, 32, 33, 34, 35. the manner of making a Screw in general; but assigned it no particular Rise; which for the aforesaid reason, these _Printing-Press Screws_ are strictly bound to have: Therefore its assigned Rise being two Inches and an half in a Revolution, This measure must be set off upon the Cilindrick Shank, from the top towards the Cube of the _Spindle_, on any part of the _Cilinder_, and there make a small mark with a fine _Prick-Punch_, and in an exact Perpendicular to this mark make another small mark on the top of the Cilinder, and laying a straight _Ruler_ on these two marks, draw a straight line through them, and continue that line almost as low as the Cube of the _Spindle_. Then devide that portion of the straight line contained between the two marks into eight equal parts, and set off those equal parts from the two Inch and half mark upwards, and then downwards in the line so oft as you can: Devide also the Circumference of the Shank of the Cilinder into eight equal parts, and draw straight lines through each devision, parallel to the first upright line; and describe the _Screw_ as you were directed in the afore-quoted place; so will you find that the revolution of every line so carried on about the Shank of the Cilinder, will be just two Inches and an half off the top of the Shank: which measure and manner of working may be continued downward to within an Inch and an half of the Cube of the _Spindle_. This is the Rule and Measure that ought to be observ’d for ordinary _Presses_: But if for some by-reasons the aforesaid Measure of two Inches and an half must be varied, then the varied Measure must be set off from the top of the Cilinder, and working with that varied Measure as hath been directed, the _Toe_ of the _Spindle_ will come down lower in a revolution if the varied Measure be longer, or not so low if the varied Measure be shorter. There is a Notion vulgarly accepted among Workmen, that the _Spindle_ will Rise more or less for the number of _Worms_ winding about the Cilinder; for they think, or at least by tradition are taught to say, that a _Three-Worm’d Spindle_ comes faster and lower down than a _four-Worm’d Spindle_: But the opinion is false; for if a _Spindle_ were made but with a _Single-Worm_, and should have this Measure, _viz._ Two Inches and an half set off from the top, and a _Worm_ cut to make a Revolution to this Measure, it would come down just as fast, and as low, as if there were two, three, four, five or six _Worms_, &c. cut in the same Measure: For indeed, the numbers of _Worms_ are only made to preserve the _Worms_ of the _Spindle_ and _Nut_ from wearing each other out the faster; for if the whole stress of a _Pull_ should bear against the Sholder of a single _Worm_, it would wear and shake in the _Nut_ sooner by half than if the stress should be borne by the Sholders of two _Worms_; and so proportionably for three, four, five _Worms_, _&c._