HARMONIC ANALYSIS! AND PREDICTION OF TIDES 145 
foot height dial is used, 2 for the 20-foot height dial, 4 for the 10-foot 
height dial, and 10 for a 4-foot height dial. The working scale 
should be entered at the head of the column and used as a factor 
with the amplitudes in order to obtain the values for this column. 
428. Columns C and D are designed to contain the adapted epochs 
in positive and negative forms which may be used additively with the 
Greenwich (V,+14)’s. It will be found most convenient to compute 
column D first, by applying the difference in column A to the « in 
the preceding column and entering the result with the negative sign. 
If the direct application of the difference should give a negative 
result, this must be subtracted from 360° before entering in column D. 
DEPARTMENT OF COMMERCE 
U, S. COAST AND GEODETK SURVEY 
rm No. 5 
eUHHIES | SETTINGS FOR TIDE PREDICTING MACHINE 
AMPLI- DIAL SETTING 
TUDES || 
SETTING | Jan. 1, 0% Dec.31,24>| 
fl. ana o arora Sena aan 
2 |). delQ..|. 8209 H. 
1.30 54 4 
2-10 | 214 
|, 3255 | 255. 
oe 
Marigram scale .....-7°.7.~ ..-..... 2.2... 
E2U7a 
228 
ie P, || 1,10 | 242 
eae [ee Glens 5 Cae |e 32. 
--|}---220.} 149 |. 
FIGURE 33. 
