PLEASE NOTE: Advanced Physics Equipment is built-upon-order. We do not stock these items in house, but order them built when an order is placed. Build orders take approximately 90 days.
-
Improved
Oil Drop Injection for Easier
Capture
-
Built-In
Video Camera and Included Monitor for Better
Results
-
Compact
Unit - No Setup
Needed
This
compact Millikan Oil Drop Apparatus has been upgraded for increased
performance and convenience, and includes a permanently- installed
video camera on the observing microscope, digital readouts
for
the capacitor voltage and timer, and an 8" monitor for
observation and control. The unit comes in a sturdy metal case, and
includes silicone oil, an atomizer, a dropper for filling the oil,
and a full operator’s
manual.
The
measuring chamber arrangement consists of the capacitor chamber with
a double illuminator and observation hole built into the side wall,
and two outer acrylic chambers (see schematic). A cloud of oil drops
from the atomizer is sprayed directly into the upper chamber where
the turbulence is allowed to die out. A metal shutter is now opened
to permit a small stream of drops to fall into the lower settling
chamber and draft shield. A smaller
selection
of
the
drops
falls
through
a
small
hole
into
the
measuring
chamber.
This
arrangement
reliably
produces
a
stream
of
charged
droplets
moving smoothly down the axis of the
capacitor.
The
charged drops’ accurate location and the light color of the
silicone oil make
the
drops
easy
to
locate
and
capture
-
alleviates
a
common
problem
with many Millikan apparatus designs. Oil drops generally carry fewer
electronic
charges
than
the
latex
spheres
sometimes
used.
This
makes
the
analysis histogram easier to
interpret.
The
microscope and camera arrangement are designed for precise
measurement
and
ease
of
use.
The
combined
drop
observation
system
is
calibrated so that one division on the grid displayed on the computer
monitor corresponds to 1mm at the focus of the microscope. The
illuminator
consists
of
two
bright
red
LEDs
whose
reflected
light
is
readily
detected
by
the
camera.
The
resolution
of
the
system
is
sufficient
that
the
slight Brownian motion of the falling drops is readily
observable.
The
measuring
system
consists
of
a
high
voltage
power
supply
controlled
by a potentiometer and pushbutton reversing switch as well as a
timer. Measurements
can
be
made
using
either
the
balancing
technique
or
the
rise time/fall time
technique.
Instruction manual available on request in pdf format.
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