Transcript The History of the Microscope

History of the
Microscope
I.
Microscope=
An instrument that makes
small objects look larger.
A. The Inventors:
1. 1590 Hans &
Zaccharius Janssen
a. Dutch lens grinders
b. made the 1st compound
microscope (has more than
one lens)
2. 1609 Galileo
a.
b.
Improved on the
Janssen’s ideas
Made a
microscope that
could be focused
3. Anton Van Leeuwenhoek
1632-1723
a.
b.
c.
Dutch scientist who
greatly improved lens
grinding
1st to see bacteria,
yeast, blood cells, and
life in pond water
Made people aware of
microscopic life
And now, time out
for a word from
your sponsor….
Leeuwenhoe
k
Unlikely

scientist
A
tradesman (a
fabric merchant, a
surveyor, a wine
assayer, and a
minor city official)
 No university
degrees
 Knew no language
other than Dutch
…oh Leeuwenhoek
 But
he had skill, he was hardworking,
had an endless curiosity, and he kept
an open mind
 His researches opened up the world of
microscopic life to scientists
His Inspirations…
 Leeuwenhoek
saw Robert Hooke’s
illustrated book Micrographia which
showed Hooke’s own observations with
a microscope
Anton’s creations:
 Made
over 500 simple
“microscopes”
 Microscopes were simply
powerful magnifying
lenses
 Specimens were mounted
on the sharp point that
sticks up in front of the
lens
Anton’s Microscopes:




Compound microscopes invented around 1595
But could only magnify 20-30x
But Leeuwenhoek’s simple microscope could
magnify 200x (what a great lens grinder)!
Hired a skilled illustrator to draw the things he
saw
All good researchers
share their findings….
 1673
Leeuwenhoek began writing
letters to the Royal Society of London
describing what he’d seen with his
microscopes
Eeeeewww…

17 September 1683 wrote about
observations on his own plaque “a little
white matter, which is as thick as if it
‘twere batter”
 Repeated observations on two men who
had never cleaned their teeth
 Found “an unbelievingly great company
of living animalcules, a-swimming more
nimbly than any I had ever seen up to this
time. Moreover…the animalcules…
seemed to be alive.”
WEE BEASTIES!

These were the first observations of living
bacteria ever recorded!
 He soon called them his “wee beasties”!
Oooh What He Saw!
Foraminifera
Blood
cells
CONGRATULATIONS
ANTON!
 After
50 years of
writing to the Royal
Society of London,
he was elected a full
member
 Joined Robert
Hooke, Robert Boyle,
Christopher Wren
and other great
scientists of his day
…Now, back to
your notes…
B. Compound Light Microscope
1.
2.
3.
4.
5.
Has two or more lenses
Used to study cells
Most magnify to 400x
Most powerful magnifies 2000x
Most have 3 objectives
a.
b.
c.
Low
Medium
High
6. Specimen MUST be thin
(allows light to pass through)
C. Electron Microscope
1.
2.
3.
4.
Uses electrons and
magnets
Very powerful –
magnifies 500,000x or
more
Show specimens in 3-D
Requires TV to view
image
Congratulations!
You’re finished.