18 UNITED STATES COAST AITD GEODETIC SURVEY. 



75 teeth, on inner end of short horizontal shaft, %-inch diameter. 

 On same shaft, outer end, bevel gear, 75 teeth, 30-pitch, 0.27-inch 

 face, to bevel gear, 75 teeth on lower end of veFtical shaft within 

 dial case, ^-inch diameter. 



On vertical shaft, next above preceding, releasable bevel gear, 60 

 teeth, 48 pitch, 0.17 inch face, to bevel gear, 120 teeth, on outer end 

 of intermediate shaft, 0.15 inch diameter. On same shaft, inner end, 

 bevel gear, 84 teeth, 48 pitch, 0.17 inch face, to bevel gear, 84 teeth 

 on hour pointer shaft, 0.15 inch diameter. 



On vertical shaft, next above preceding, releasable bevel gear, 180 

 teeth, 48 pitch, 0.17 inch face, to bevel gear, 60 teeth, on outer end 

 of inclined intermediate shaft, 0.15 inch diameter. On same shaft, 

 inner end, bevel gear 240 teeth, 48 pitch, 0.17 inch face, to bevel 

 gear, 60 teeth, on minute pointer shaft, 0.15 inch diameter. 



On vertical shaft, next above preceding, releasable bevel gear, 60 

 teeth, 48 pitch, 0.17 inch face, to bevel gear, 120 teeth, on outer end 

 of intermediate shaft, 0.15 inch diameter. On same shaft, inner end, 

 worm screw -^ inch diameter, 18 threads per inch, to worm wheel, 

 366 teeth, 6.47 inches diameter, on day dial shaft, ^ inch diameter. 



Inclined shaft, upper end (plate 10), bevel gear, 72 teeth, 24 pitch, 

 fl inch face, to bevel gear, 72 teeth, on vertical shaft of front com- 

 ponent frame, -^ inch diameter. On same shaft, next above pre- 

 ceding, spur gear, 110 teeth, 30 pitch, f inch face, to stud gear on 

 cross brace (plates 10 and 11), 110 teeth, to spur gear, 110 teeth, on 

 front vertical shaft of rear component frame, f inch diameter. On 

 same shaft, 'next below preceding, bevel gear, 75 teeth, 30 pitch, 

 ^ inch face, to bevel gear, 75 teeth, on front end of long horizontal 

 shaft within rear component frame, i inch diameter. On same shaft, 

 rear end (plate 12), bevel gear, 75 teeth, 30 pitch, ^ inch face, to 

 bevel gear, 75 teeth, on rear vertical shaft of rear component frame, 

 I inch diameter. 



From the vertical shaft in the front component frame (plate 10) 

 motion is conveyed by releasable bevel gears to bevel gears on hori- 

 zontal intermediate shafts f inch diameter, by bevel gears at their 

 inner ends to bevel gears on component shafts ys i^^h diameter, all 

 the bevel gears in the front component frame are of 40 pitch and 

 0.24 inch face. 



From the front vertical shaft in the rear component frame (plate 

 11) motion is conveyed by releasable bevel gears to bevel gears on 

 horizontal intermediate shafts, -f^ inch diameter, by bevel gears at 

 their inner ends to bevel gears on 16 component shafts. 



From the rear vertical shaft of the rear component frame (plate 12) 

 motion is conveyed by releasable bevel gears to bevel gears on hori- 

 zontal intermediate shafts, -^ inch diameter, by bevel gears at their 

 inner ends to bevel gears on 10 component shafts. The 5 remaining 



