Ngày tải lên :
02/07/2014, 13:20
... William
Beecher,
AO's
founder,
produced
steel
eyeglasses
on
equipment
of
his
own
invention.
Five
years
later,
the
product
line
was
extended
to
gold
frames.
By
1898,
AO
was
establishing
industry
standards
for
certain
lenses.
A
research
laboratory
was
established
in
1909,
one
that
was
to
attract
a
significant
pool
of
talent,
and
AO
was
awarded
a
number
of
patents
in
the
optics
industry.
In
the
early
1920s,
the
Spencer
company
in-
troduced
optical
spectrometers,
goniometers,
and
re-
fractometers.
In
1935,American
Optical
acquired
the
Spencer
Lens
Company,
which
operated
as
AO's
In-
strument
Division
as
of
1945.
By
the
1920s,
the
company
had
expanded
from
con-
sumer
eyeglasses
into
industrial
safety
products
and
expanded
further
into
military
optics
in
the
early
years
of
World
War
II.
Many
renowned
scientists
in
the
optical
community
have
worked
at
one
time
or
another
for
American
Optical.
While
AO
didn't
express
much
interest
in
fiber
optics
in
the
1950s,
W.
Hicks,
arecentAO
em-
ployee
who
left
to
fonn
another
company,
succeeded
in
fabricating
a
fiber
filament,
through
fiber
pulling,
that
could
transmit
light
as
a
single-mode
waveguide,
in
1959.
The
potential
of
the
single-mode
waveguide
was
recognized
by
Elias
Snitzer
and
described
by
him
in
a
paper
written
in
1961.
During
the
1960s
and
1970s,
many
pioneering
opti-
cal
medical
instrument
components
were
produced
by
AO.
In
1999
-
2000,
American
Optical
was
ac-
quired
by
SOLA,
an
Australian
lens
company.
American ... societies
and
government agencies. The ANSI Federation
© 2003 by CRC Press LLC
Fiber
Optics
Illustrated
Dictionary
network
transmissions
protocols
with
addresses
as-
signed
in
the
.
ampr.org
domain.
The
sharing
ofpacket
radio
communications
among
amateur
radio
buffs
began
with
packet
bulletin
board
systems
(PBBSs)
similar
to
the
BBSs
popular
with
computer
hobbyists
in
the
early
and
mid-1980s.
The
main
differences
between
the
two
were
that
computer
BBSs
were
primarily ... Teachers
AAPT.
The
AAPT
supports
professional
and
research
phys-
ics
and
physics
education
through
activities
and
pub-
lications,
including
the
American
Journal
of
Phys-
ics,
Physics
Today,
and
The
Physics
Teacher.
Phys-
ics
and
engineering
(applied
physics)
are
at
the
heart
of
the
understanding
and
development
of
all
commu-
nications
systems.
http://www.aapt.org/
43
© 2003 by CRC Press LLC
Fiber
Optics
Illustrated
Dictionary
American Wire Gauge, Brown and Sharpe Wire
Gauge
AWG.
Astandardized
wire
diameter
system,
exclusive
of
covering,
for
nonferrous
conductors
such
as
copper
and
aluminum.
With
a
range
from
1
to
40,
lower
numbers
denote
thicker
wires,
higher
ones
thin-
ner
wires.
Generally,
for
a...