zacharius jansen

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zacharius jansen
Microscope
History
Objective
• I will explain the scientific contributions
of Janssen, Hooke, and Van
Leeuwenhoek by writing a paragraph.
How to Use a Timeline for Notes
Date
Picture
Description
Microscope History
Circa 1000AD –
The first vision aid
was invented
(inventor unknown)
called a reading
stone. It was a glass sphere that
magnified when laid on top of reading
materials.
How to Fill Out My Timeline
1000AD
Microscope History
A glass sphere called
a reading stone was
invented.
14th Century–
The art of grinding lenses is developed
in Italy and spectacles are made to
improve eyesight.
How to Fill Out My Timeline
1000AD
Microscope History
A glass sphere called
a reading stone was
invented.
14th
Century
The art of grinding lenses is
developed in Italy and
spectacles are made to
improve eyesight.
Hans and Zacharias Janssen
• 1590 –Dutch
lens grinders Hans
and Zacharias
Janssen make the
first compound
microscope by
placing two lenses
in a tube.
Check Your Notes
1000AD
Microscope History
A glass sphere called
a reading stone was
invented.
14th
Century
1590
Hans and Zacharias Janssen make
the first compound microscope by
placing two lenses in a tube.
The art of grinding lenses is
developed in Italy and
spectacles are made to
improve eyesight.
Tidbits
• Galileo heard of their experiments and
started experimenting on his own. He
improved both the microscope and
telescope.
• He added a focusing device to his
microscope and advanced the field of
astronomy with his telescope.
Robert Hooke
• 1655 – Robert
Hooke used a
compound
microscope to
observe pores in
cork
– He called them
“cells”
Tidbits
• The “cells” Robert Hooke found were
from a once living thing.
• He was the first to discover that living
things were made of cells.
• This advanced our understanding in the
field of biology.
Anton Van Leeuwenhoek
• 1672-Leeuwenhoek
refined lens
grinding. Creating
lenses able to
magnify up to 270X.
• 1st to see singlecelled organisms in
pond water
• Father of Microscopy
Tidbits
• Leewenhoek’s discovery of living
organisms that could not be seen by
the naked eye, began the field of
microbiology.
• It also led to future discoveries of
viruses and bacteria.
Timed Think-Pair-Share
• How did Zaccharius and Hans Janssen,
Robert Hooke, and Anton Van
Leeuwenhoek contribute to the
scientific field?
• Janssen created the first compound
microscope.
• Hooke used the compound microscope
to discover cells in living things.
• Leewenhoek refined the lenses and
magnification and discovered
microscopic organisms.
• The discovery and advancements of the
microscope led to further advancements
in the fields of astronomy, biology, and
microbiology.
Exit Ticket
• On a half sheet of paper…
• Write a paragraph explaining how
Zaccharius and Hans Janssen, Robert
Hooke, and Anton Van Leeuwenhoek
contributed to the scientific field.
Did we meet our objective?
I will explain the scientific contributions
of Janssen, Hooke, and Van
Leeuwenhoek by writing a paragraph.
Let’s see what microscopes can do!
Raise your hand to guess what each
image is
DENTIST’S DRILL
TOILET PAPER
HYPODERMIC NEEDLE
VELCRO
STAPLE THROUGH PAPER
BLACK WIDOW SPIDER CLAW
PORCUPINE QUILL
MASCARA BRUSH
ANT
BLACK FLY
MOSQUITO
CAT FLEA
MITE FEEDING
POLLEN GRAIN
ANT EYE
APHID ON A LEAF
EYELASHES
DOG FLEA
H1N1 VIRUS

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