Deseret evening news. [volume] (Great Salt Lake City [Utah]) 1867-1920, 1906-07-11
Scientific knowledge Of
wv sound May be Gained by
Observation.
n VISIT WEATHER BUREAU.
s,udy Class at University 10 be
r.,s,tained by Or. Hyatt d.
rector Of signal station.

40 nature study class yesterday
-, T. Of L. Prof Cummings said;
ut the child make the discovery
the great law in nature study
/, taught according TO the best
- the modern school. Thus
.s., III. child learns from experiments
,,,i sound is he may be told some
-, 40, open to ordinary observa-
M, sound does. He may be told
", n, sound waves Of the air (the
N.,nsns) when the powder maya
~, an Arsenal hill exploded years
- hrokt most Of the windows IN the
,sS.ss 81 this city; how the sound OF
~ human voice often precipitates the
In N me avalanche IN the Alps how
49, sring OF a pistol in a lighted room
=, ,isht may put out the lamp or cam
~, These and other interesting phe-
s,nsna should follow, not precede, the
'srcrete facts tperceptS obtained
rom observation.
LAWS OF SOUND.
The laws Of sound, therefore, are
tfr developed by the use Of the PEN
alum showing the law Of It's vibration
,erording TO its length then il is
,hown that an elastic steel spring free
"a oscellate is a pendulum. that Vi
mating string is a pendulum, etc, that
he greater the tension and the great
n The force Of gravity operating on
& common pendulum the more rapid
viii be the vibration, that length and
diameter Of the vibrating string, rod,
ar reed. affect the pitch: that vibrating
rrings. sounding boards, etc, divide
INTO parts or segments nodes and
yibrate both In sections and as
whole
After deducing the laws Of sound the
mechanism Of the human voice its
mes, care culture, etc. should be taxi !
On W at first by means OF experiments |
With the voices of the children
The professor has urged that the |
nature study classes, should note and
tndssyor 10 forecast the weather The |
government signal service stations |
tr great aid in this direction, and
their publications should be IN the
hands Of the teacher. The class voted
10 visit the weather bureau in this
-iy next week and Or Hyatt has
0urieously furnished for the News
he accompanying storm map together
nth description OF the ordinary
weather. map given herewith
DAILY WEATHER MAP.
The weather map issued daily by the
|, : weather bureau and distributed |
10 those who are interested Is q wei
Known publication. II shows the sta
tons at which weather obsery ations
ar AIKEN daily AT a. w. and 5 p m.
time. These observations
insist OF readings Of the barometer
ermometer (dry and wet). direction
ID velocity Of wind. state Of weather.
Mount kind. and direction OF the
ouds and amount Of rain or snow.
"a are telographed 10 Washington
% 20 many Of the weather bureau
atoms throughout the country for
blcation on maps and bulletins
lId lines called isobars are drawn
rough points havlno the same at
lspheric pressure separate line
lng drawn for each one.tenth Of an
h IN the height Of the barometer
tied lines. called isotherms. con-
ting places having the same tenn
-alure. are drawn for each ten de- :
res Of the thermometer. Heavy
ted lines. inclosing areas where a
.lded change In temperature has oc- {
red within the last q hours. are q
netimes aided The direction Of the {
N Is indicated by an arrow flying s
h the wind, or opposite 10 the or {
airy vane. The state Of weather 4
ether clear. partly cloudy cloudy. 5
ming. or snowing--is indicated by / :
circular symbol Shaded areas !
on used, show where rain or snow o
fallen since the last observation. ?
IT AND DRY THERMOMETER. =
he temperature OF the air as pub Il
ed on the man Is observed with a a
bulb thermometer. A reading OF s.
wet-bulb thermometer-that Is.
whose bulb is covered with a moist
pplng-is also made. but not pub
cd. The evaporation from the wet