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BUt it sometimes happens that the Ceiling of the Work-room is not high enough for the Pole to play upwards and downwards; Therefore in such case, they place the thin end of the Pole at some con∣siderable distance off the Lathe, either before or behind
it, and so make the Spring of the Pole Horizantal towards the Lathe, conveying and guiding the String from the Pole to the Work by throwing it over a Rowler, moving on two Iron Center-pins fastned at both ends, and placed parallel to the Cheeks of the Lathe, above the Work as high as they can; and thus every Tread draws the Row∣ler about: But should the Rowler not move about upon those Iron Pins, the String every Tread would both cut a Groove in the Ruler, and fret it self more or less upon the Rowler.