. Watch and clock escapements; . The Detached Lever Escapement. 83 he attempts to correct by drawing the locking face at fifteendegrees draw. We shall show that neither C nor C, Fig. 85, is the theoret-ically correct position for the pallet center for a tangential locking. We will now take up the consideration of a club-tooth leverescapement with circular pallets and tangential lockings ; but pre-vious to making the drawings we must decide several points, amongwhich are the thickness of the pallet arms, which establishes theangular motion of the escape wheel utilized by such pallet arms,and al
. Watch and clock escapements; . The Detached Lever Escapement. 83 he attempts to correct by drawing the locking face at fifteendegrees draw. We shall show that neither C nor C, Fig. 85, is the theoret-ically correct position for the pallet center for a tangential locking. We will now take up the consideration of a club-tooth leverescapement with circular pallets and tangential lockings ; but pre-vious to making the drawings we must decide several points, amongwhich are the thickness of the pallet arms, which establishes theangular motion of the escape wheel utilized by such pallet arms,and also the angular motion imparted to the pallets by the impulse & ./•* \ \. Fig. 87 faces of the teeth. We will, for the present, accept the thicknessof the arms as being equivalent to five degrees of angular extent ofthe pitch circle of the escape wheel. In making our drawings we commence, as on former occasions,by establishing the center of our escape wheel at A, Fig. 87, andsweeping the arc a a to represent the pitch circle of such the center A we draw the vertical line A B, which is sup-posed to also pass through the center of the pallet staff. Theintersection of the line A B with the arc a we term the point d, andfrom this point we lay off on said arc a thirty degrees each side ofsaid intersection, and thus establish the points c b. From A, throughthe point c, we draw the line A c J. On the arc a a and two and ahalf degrees to the left of the point c we establish the point /, whichspace represents half of the thickness of the entrance pallet. From 84 Watch and Clock Escapements. A we draw through the point f the line A f f. From /, and atri
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Keywords: ., bookcentury1900, bookdecade1900, bookidwatchclockes, bookyear1904
