HARMONIC ANALYSIS AND PREDICTION OF TIDES 143 
crank more slowly until the machine is stopped as the indexes come 
in contact with each other. The time and height may then be read 
directly from the dials on the face of the machine. The movement 
of the height pointer before the stopping of the machine and also 
the tide curve will clearly indicate whether the tide is a high or low 
water. After the tide has been recorded an inward pressure on the 
crank handle will release the brake and the machine can be turned 
forward to the next tide, the process being repeated until all the 
tides of the year have been predicted and recorded. 
FORMS USED WITH TIDE-PREDICTING MACHINE 
421. Form 444, standard harmonic constants for predictions (fig. 
32).—This form provides for the compilation of the harmonic con- 
DEPARTMENT OF COMMERCE TIDES 
Th caeeeeyNcs sage PHRRENES STANDARD HARMONIC CONSTAN:S FOR PREDICTION 
Lat. 95 ° 22" Ne 
STATION ____- BLOT RO ssC BLL LOT IN Bane i rt da ec Long.l2Q, ° 51. We... 
Long... 120.85° Vio 
H 
AMPLITUDE 
The DATUM is a pteme fe. 
: low sertersprings= 
befow mean { lower low water 
|] 02006 | 148.3 _ +2066 
0.025 | 174.2 || +18.0] 0. 
(0-035 | 260-5) 
(0.026 | 123.3) = 8.3] 0010 _ 
(0.009 |.30626) || +6420} 0.04 _ 
Lr | 0.050 | 30705_||_+ Se! 
(2MK); 
00103. 289.8 | +.1.0| 0.41. 
--|| 0.2007. | 105.06. |].. 
Compiled by ---vePeDe....March 28, 1923, 
(Date) 
FIGURE 32. 
