106 U. S. COAST AND GEODETIC SURVEY 
306. Stencils (figs. 10 and 11).—The first figure is a copy of the 
M stencil for the even hours of the first 7 days of the series, and the 
second figure illustrates the application of the same. This stencil 
being laid over the page of hourly heights shown in figure 9, the 
heights applying to each of the even constituent hours for this page 
show through the openings in the stencil, where they appear con- 
nected by diagonal lines, thus indicating each group to be summed. 
307. For each constituent summation, excepting for S, there are 
provided two stencils for each page of tabulated hourly heights, one for 
the even constituent hours and the other for the odd constituent hours. 
Deranruentor commerce TIDES; HOURLY HEIGHTS 
Station: Year: Ba | 
ChiofiolPart ye ot Ss eee at Lone: 
Time Meridian; __________. Tide Gauge No. Scale L: Reduced to Staff. — 
d. 1 d. : d. d. 
= ___Divisor=696;_mean for 29 days= 
FIGURE 10. 
