stereoscope a.k.a. dissection scope scanning electron

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Introduction to the Microscope
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History of Miniature Viewing
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The Year 100AD

• Glass had been invented and the Romans were
  testing it. 
• They experimented with different shapes of clear
  glass and one of their samples was thick in the
  middle and thin on the edges.  They discovered
  that if you held one of these odd shaped glass
  pieces over an object, the object would look
  larger. 

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Zoom.
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Pyros Were Given a Gift!

• Someone discovered that you can focus the rays of
  the sun with one of these special glasses and
  start a fire. 
• Thus early lenses were called burning glasses or
  magnifiers.

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Time goes by

• These lenses were not used much until the end of
  the 13th century when spectacle makers were
  producing lenses to be worn as glasses.

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Important Discovery

• Sometime about the year 1590, two Dutch spectacle
  makers, Zaccharias Janssen and his father Hans
  started experimenting with these lenses...
• They made the first compound microscope

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Galileo

• He added a focusing device to his microscope

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Anthony Leeuwenhoek

• He became so interested that he learned how to
  make lenses.  By grinding and polishing, he was
  able to make small lenses with great curvatures. 
  These rounder lenses produced greater
  magnification, and his microscopes were able to
  magnify up to 270X!

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Anthony Leeuwenhoek

• With his new improved microscope, he was able to
  see things that no man had ever seen before. 
• He saw bacteria, yeast, blood cells and many tiny
  animals swimming about in a drop of water.

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Years Past

• Little was done to improve the microscope until
  the middle of the 19th century when great strides
  were made and quality instruments like todays
  microscope emerged.

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Microscopes Today
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Types of Microscopes

• Light microscope
• Stereoscope
• (a.k.a. - Dissection Scope )
• Scanning Electron Microscope
• Transmission Electron Microscope

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Light Microscope

• The models found in most schools, use compound
  lenses and light to magnify objects. The lenses
  bend or refract the light, which makes the object
  beneath them appear closer.

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Stereoscope

• This microscope allows for binocular (two eyes)
  viewing of larger specimens.

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Scanning Electron Microscope

• Allows scientists to view a universe too small to
  be seen with a light microscope. S.E.M.s dont
  use light waves They use electrons (negatively
  charged electrical particles) to magnify objects
  up to two million times.

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Mosquito
Human Hair
Shining Flower Beetle
Green Algae
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Transmission Electron Microscope

• Also uses electrons, but instead of scanning the
  surface (as with S.E.M.s) electrons are passed
  through very thin specimens.

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Introduction to Microscope Use
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Microscope Care

• Always carry with 2 hands
• Only use lens paper for cleaning
• Do not force knobs
• Always store covered
• Keep objects clear of desk and cords

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Microscope Parts
A.Eye Piece Contains the OCULAR lens
K.ARM Used to SUPPORT the microscope when carried
B. Nose Peice Holds the HIGH- and LOW- power
objective LENSES can be rotated to change
MAGNIFICATION.
J. COARSE ADJUSTMENT KNOB Moves the stage up and
down for FOCUSING
C. OBJECTIVE LENSES Magnification ranges from 10
X to 40 X

I. FINE ADJUSTMENT KNOB Moves the stage slightly
to SHARPEN the image
D. STAGE CLIPS HOLD the slide in place
E. STAGE Supports the SLIDE being viewed
H. DIAPHRAGM Regulates the amount of LIGHT on the
specimen
F. LIGHT SOURCE Projects light UPWARDS through
the diaphragm, the SPECIMEN, and the LENSES
G- BASE Supports the MICROSCOPE
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Using the Microscope

• Place the Slide on the Microscope
• Use Stage Clips
• Click Nosepiece to the lowest (shortest) setting
• Look into the Eyepiece
• Use the Coarse Focus

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Using High Power

• Follow steps to focus using low power
• Click the nosepiece to the longest objective
• Do NOT use the Coarse Focusing Knob
• Use the Fine Focus Knob to bring the slide

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Magnification
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Quiz Time

• Try Your Best to Answer the Questions You Have
  30 Seconds to Answer Each Question.

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How Do You Feel Today?

• Good
• Excited
• Sad
• Happy

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Who Made the First Compound Microscope?

• Galileo
• Leeuwenhoek
• Janssen
• The Romans

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What Part of the Microscope Holds the Slide in
Place?

• Base
• Eye Piece
• Stage Clips
• Arm

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What Microscope Scans the Surface of Things Super
Microscopic?

• SEM
• TEM
• Light Microscope
• Steroscope