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energy geography
weather
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Cards (10)
Rain Gauge
Has a
fixed diameter
so that they collect the same amount of
water
Comparisons
can be made
Rain Gauge
1.
Funnel
(A) to collect the
water
2. Container to collect
water
, which may be
graduated
3.
Emptied
once every
24hrs
Rain
measurement
Measured in
millimetres
Rain
Gauge
Sunk
into the ground, but not
level
, so
splashes
or surface
water
can't get in
Anemometer
Three
light
rotating
cups (mounted on a
high
pole) are
blown
around by the
wind
The
revolutions
are counted &
converted
into
m/s
,
km
/
h
or
knots
Sunshine
Recorder (Heliograph)
Burns
a
timeline
Trace
sunshine
not the hours of daylight
The
glass ball
focuses the light
This
burns
a line onto the
card
Max-min
thermometer
Max thermometer contains
mercury
& min contains
alcohol
As temp.
rises
, mercury
expands
& pushes up a
metal index
, and when it cools,
mercury
contracts
, and the
index
is left in place at
highest
temp
As temp. falls,
alcohol
contracts
& pulls
metal
index with it; but as
alcohol expands
, it flows
past
index, leaving it at its
lowest
temp
Both indexes read from the
bottom once
every
24hrs
Wet
& dry bulb thermometer (hygrometer)
A dry bulb is a
normal mercury thermometer
, and it measures actual
air
temperature
The wet bulb is the same but is covered with a
fine cloth
connected to a
water reservoir
Water evaporates
from the
cloth
&
cools
temperature so it
reads
a few degrees
lower
than air temp
Both
wet
&
dry bulb
temperatures read
Barometer
An
aneroid barometer
has a
vacuum chamber
As
air pressure rises
& falls, the
chamber contracts
& expands
Levers conduct this movement to a spindle, which moves the
pointer
on the dial, which records the
air pressure
in mmHg
Wind
Vane
The
wind
blows the fletching so that the arrowhead points into the wind
Mounted on high places (
rooftops
)
Make sure no trees are
blocking