PENDULUM METHODS 



173 



device. The rewind mechanism is a spool on a 

 shaft carrying a blank record strip C. The ends 

 of this shaft are fixed in horizontal aligning open- 

 ings at one side edge of the plate and bracket. 

 The worm gear D fixed on a shaft has one side 

 against the plate and its opposite side face in a 

 vertical plane with the inner face of the flange of 

 the spool. The rewind spool is secured on the 

 shaft between the worm gear D and the bracket 

 and has side flanges. About midway between 

 the rewind spool and the upper inturned arm, 

 and at the side edges of the plate, is a pair of 

 idler rollers E mounted on pins fixed in the plate 

 and extending inward and lying parallel with the 

 rewind spool shaft. Over these the record strip 

 passes from the spool (Fig. 112) presenting a flat 

 surface for the inking device. The part of the 

 strip down on the other side winds on to the 

 rewind spool. The spool is driven by a spring 

 motor F with a worm screw engaging in the worm 

 gear in the space between the rewind spool and 

 idler rollers. This revolves the spool clockwise, 

 thus rewinding the strip, and its speed may be 

 controlled. A pear-shaped pendulum attached 

 by a string to an eyelet screw in the upper 

 upturned arm of the frame lies centrally between 

 the idler rollers and in vertical line with the 



■'Plumb Bob Jo'ini 

 allowing movemeiri- 

 in one plane only 



■Seqmeni fastened fo. 



Degrees 

 307010 

 I5|5 



Feet 

 120 

 240 

 360 



480 

 600 



720 



840 



960 



1080 

 1200. 

 1320 

 1440 

 1560 

 1680 

 1800 

 1920 

 2040 



2160 

 2280 

 2400 

 2520 

 2540 

 2760 

 2880 

 3000 



3120 



,-5 olid Cylindrical 

 Weight aciing as 

 Plumb Bob 



Pulling' 

 Out 



■Pen 



Fig. 113. 

 Fig. 113. — Sketch showing method of transferring plumb-bob 

 motion to the pen. 

 Fig. 114. — A record with Kinley's apparatus. 



Fig. 114. 



