488 
The Philippine Journal of Science 
serve; fortunately, the Galaxy stretched across the heavens in 
a plane oblique to the direction of the sun, so that after three 
mornings I was able to estimate the moment of zenith passage 
with some accuracy and consistency. 
The watch, etc., were the same as used previously. The watch 
was checked twice on most days of my stay in Baguio; always 
by the telegraph time signals at 11 o’clock in the morning when 
they did not fail, which they sometimes did; again about 6 in 
the afternoon by the pendulum clock of the Meteorological Ob- 
servatory on Mount Mirador; and a proper allowance was made 
for the temperature changes shown by the two comparisons 
to have a considerable effect on the watch. 
Measurement on the map showed the station at Outlook Point 
to be nearly in the same latitude as Mount Mirador, and about 
2 minutes 8 seconds eastward; so I took for its coSrdinates, 
Latitude North 16° 25.0', Longitude East 8 hours 2 minutes 32 
seconds; its height is not essential, but is marked as 1,464 meters, 
or very nearly at the upper limit of the lower haze. That this 
limit was still about 1,500 meters was shown repeatedly by 
sighting on the setting sun with a Locke hand level supported 
on a camera tripod at Mount Mirador, where the station ba- 
rometer cistern is stated by the observers to be 1,512.5 meters 
high. The sun, which had been very brilliant, plunged quite 
suddenly into the haze just as it passed the sighting line of the 
level. 
Rejecting the three practice observations, the table shows the 
results, computed with four-place logarithms, and retaining 
tenths of minutes, though these are not significant. 
Date, 1920. 
Hour 
east 120°. 
Sun’s 
altitude. 
Sidereal 
time. 
H. m. s. 
4 33 9 
4 31 48 
4 31 20 
o / 
—15 43.1 
—15 51.6 
—15 48.0 
H. m. s. 
18 38 4 
18 40 38 
18 44 7 
24 
26 
—15 47.6 
Lower limit to atmospheric extent, H> 211.0 kilometers; 
which may be compared with 181.6 kilometers, the largest value 
deducible from the data of the previous paper, and with 70 
kilometers, deduced by others from horizon observations of dawn 
and twilight. 
