168 
Sea-surface temperature, diurnal var- 
iation of, effect of wind on, 33 
Fourier analyses of mean, 34 
frequency distribution of hours of 
eo cunence of maximum, 
0 
frequencies of hours of occur- 
rence of maximum, 31 
frequencies of unperiodic daily 
amplitude of, 32 
harmonic analysis of data, 33 
hourly values, for groups, 28, 29 
instruments, 27 
maximum and minimum, 29 
and hours of occurrence, 30 
mean daily, by groups, 30 
time of occurrence, 36 
maximum on clear days, 33, 34 
minimum, 32 
mean, for groups, 27 
corrected for noncyclic 
changes, 27 
Pacific Ocean, North, 38 
regional variations in, 37 
unperiodic variations, 29 
variations 
for all days, 31 
with air-temperature differ - 
ences, 35 
with latitude, 37 
Sea temperatures 
differences between, 37 
diurnal variation, 37 
Sea-water 
evaporation, 24-hour values of, 53 
thermograph, 27 
depth, 27 
Semidiurnal variation of temperature, 
2 
nellius, 21, 30, 31, 35 
Southern Equatorial Current, 38 

Counter, 38 
State of the sea, 55 
effect of, on diurnal variation of 
Sce7 Surface temperature, 
frequencies of International Num- 
bers at noon, 56 
mean International Numbers at 
noon, 56 
Stevenson screen, 24 
meteorological screen, 13 
Negretti-Zambra, 39 
Superadiabatic lapse rates, 18, 39, 40 
Sverdrup, H.U., 
r 
Tahiti, 18, 40 
Papeete, 70, 71 
Temperature, 
absolute maximum 19 
mean daily maximum and mini- 
mum, 19 
departures from normal monthly 
values, 29 
diurnal variation of, 25 
frequency. of hours of minimum, 
readings, difference between 
Hartmann and Braun in- 
struments on deck and on 
crosstrees, 17, 18 
INDEX 
Temperature, semidiurnal variation 
of, 25 
six-hour variation, 26 
time of occurrence of maximum 
and minimum, 19 
Thermograph, 13 
Electrical-resistance, Hartmann 
and Braun, 13 
sea-water, 27 
Thermograms, evaluation of, 14, 27 
Thermometers, 
air temperature, 13 
calibration of, 13 
reversing, 27 
sea-water, 27 
screens, ventilation of, 21 
Thunderstorms, 56 
Time of maximum amplitude, 11 
Time of occurrence of maximum and 
minimum 
sea-surface temperatures, 30 
temperatures, 19 
Titration, finding salinities by, 52 
Tuamotu Island, 17 
Twelve-hour waves of atmospheric 
pressure 
from observations at sea and as 
computed by Simpson, 
comparison of, 8 
observed on Carnegie and on 
Gauss, comparison of, 8 
on islands and at sea, compari- 
son of, 10 
over South Pacific Ocean, 11 
Twenty-four -hour values of sea-water 
evaporation, 53 
Tycos anemometer, 52 
Typhoon, 4, 74 
U 
Unperiodic amplitude, 33 
atmospheric pressure, 6 
daily, 4 
clear days, 33 
cloudy days, 33 
Unperiodic variations in sea-surface 
temperature, 29 
Vv 
Vapor pressure, 41 
absolute maximum, 41 
absolute minimum, 41 
daily range, 41 
diurnal amplitude, 
effect of wind on, 45 
frequency distribution of un- 
periodic, 43 
mean unperiodic, 43 
variation with latitude, 45 
diurnal variation of, 43 
for all days, 44 
Fourier analysis of, 44 
frequencies of hours of occur- 
rence of maximum, 42 
and minimum, 43 
harmonic analysis of data, 45 
maximum and minimum, 41 
hour of mean, 42 
mean, 42 
mean for groups, 41 
Vapor pressure, mean for groups, 
hourly values of, 40, 41 
variation of, 46 
with air temperature, 46 
with latitude, 45 
with sea- and air-tempera- 
ture differences, 45 
Variation of, 
air temperature, 
diurnal amplitude with lati- 
tude, 21 
mean, with latitude, 17 
with air ge mbes ete changes, 
5 
atmospheric pressure, 
diurnal variation of, 5 
relative humidity, 
diurnal amplitude of, with 
latitude, 49 
with differences between sea 
and air temperature, 
with latitude, 51 
with sea- and air-tempera- 
ture differences, 50 
sea-surface temperature, 
differences and air-temper- 
ature differences, 
with latitude, 35 
diurnal amplitude of, with 
latitude, 32 
for all days, 31 
with latitude, 37 
vapor pressure, 
diurnal amplitude of, with 
latitude, 45 
with air temperature, 46 
with latitude, 45 
with sea- and air-tempera- 
ture differences, 45 
ven of thermometer screens, 
rate of, 39 
WwW 
Washington, D. C., 64 
Wet-bulb lapse rates between deck, 
crosstrees, anc mainmast, 39 
Wind, 55 
directions, frequéncies of, at 
noon for groups, 56 
effect of on diurnal amplitude 
of relative humidity, 49 
of vapor pressure, 45 
effect of on diurnal variation 
of air temperature, 21 
effects, 21 
pate turbulence, 
2 
of Ae outer temperature, 
3 
speed 
frequencies, 55 
mean Beaufort Numbers at 
noon, 55 
velocities, 
highest, 55 
lowest, 55 
variation with diurnal am- 
plitude, 21 
Windy days, periodic amplitude, 33 | 

