American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 223
cal in shape in orderto be made thin without lessening ther dura-bility. As far as regards the vertical positions, thegreatest narrowness of the holes consistentwith freedom of motion will be of importance.Very frequently differences arise in consequenceof the incorrect form of the pivots. If they… … There is, of course, always a very small shakein the holes necessary on account of the oil, andwhen, therefore, such an oval-shaped pivot is inthe position indicated by Fig. 6, its centre isfarther from the lowest point of the hole thanwhen it is in a position as in Fig. 7, and whenthe balance…
Clocks and watches
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