14 



U. S. COAST AND GEODETIC SURVEY 



Figure 10. — -Standard automatic tide gage (paper installation). 



23. If the time clock runs consistently fast day after day, the regu- 

 lating lever should be moved slightly toward the letter "S"; and if 

 consistently slow, the lever should be moved toward the letter "F," 

 care being taken not to move the lever so far as to introduce an error 

 in the opposite direction. A movement of the regulating lever of 1 

 division usually changes the rate about 3 minutes per day. If the 

 loss or gain in any 1 day is less than 3 minutes, it is, in general, inad- 

 visable to move the regulator unless there has been a similar loss or 

 gain on a number of consecutive days. No refined regulation is nec- 

 essary for the motor clock. Normally this runs at a rate which moves 

 the paper forward 1 inch an hour, but any small variation from this 

 rate is unimportant. 



24. A spindle operated by the motor clock extends through the back 

 of the clock case and has secured to its extremity a toothed carrier 

 wheel (35, fig. 6), also known as the clutch wheel, which actuates 

 the main roller of the gage when engagement is made through a 

 hinged carrier or clutch arm (34) attached to the roller. Projecting 



