2. The Letter As the letter is read, consider the following Content Intention Creator Recipient

3. How does a microscope work? 1.Look through one hand lens and make observations. 2.Stack two hand lenses together and make observations. 3.Try to focus the image clearly. What did you need to do to focus the image?

4. Journal Entry

5. The Royal Society of London Established in 1660, the Royal Society is a fellowship of the world's most eminent scientists and is the oldest scientific academy in continuous existence. One of its roles is to fund scientific research, and as such, has released several publications globally to communicate its efforts.

6. The Letter In this activity, you will think and act as a scientist whose observations have led to some significant discoveries regarding the development of the microscope. Based on some of your observations, you will write a letter to the Royal Society of London requesting a grant, lab space or publication rights.

7. The Microscope by Maxine Kumin Anton Leeuwenhoek was Dutch. He sold pincushions, cloth and such.

8. The waiting townsfolk fumed and fussed He worked, instead of tending store, At grinding special lenses for A microscope. Some of the things He looked at were: mosquitoes’ wings,

9. The hair of sheep, the legs of lice, The skin of people, dogs and mice;

10. Of his own blood, and best of all, The unknown busy, very small Bugs that swim and bump and hop Inside a simple water drop.

11. Impossible! Most Dutchmen said. This Anton’s crazy in his head. We ought to ship him off to Spain. He says he’s seen a housefly’s brain.

12. He says the water that we drink Is full of bugs. He’s mad, we think! They called him dumkopf, which means dope. That’s how we got the microscope.

13. What will you find on your slides?

14. Introduction to the Microscope  Parts  Focusing  Care

15. Eyepiece Body Tube Revolving Nosepiece Arm Objective Lens Stage Stage Clips Coarse Focus Fine Focus Base Diaphragm Light Power switch

16. Objective Lens – 3 lenses that magnify the object viewed - the longer the lens the more powerful the magnification Diaphragm – controls the amount of light that shines on the slide Stage – where the slide is placed and viewed Coarse Focus – brings the picture into sight Fine Focus- makes picture even clearer

17. General guidelines 1.Make sure all books, folders, etc. are out of the aisles. 2. Always carry the microscope with one hand on the Arm and one hand on the Base. Carry it close to your body. 3.Remove the cover, plug the microscope in, and place the excess cord on the table! If you let the excess cord dangle over the edge, your knee could get caught on it, and the next sound you hear will be a very expensive crash. I will bill you later!

18. 3. Always start and end with Low Power! 4. Place the slide on the microscope stage, with the specimen directly over the center of the glass circle on the stage (directly over the light). 5. Use the coarse focus to bring the specimen into view.

19. NOTE: If you wear glasses, take them off; if you see only your eyelashes, move closer. Be sure to close, or cover your other eye!! NOTE: If you see a dark line that goes part way across the field of view, try turning the eyepiece. That dark line is a pointer that will be very valuable when you want to point out something to your lab partner, or your teacher!

20. 6. Adjust the Diaphragm as you look through the Eyepiece, and you will see that MORE detail is visible when you allow in LESS light! Too much light will give the specimen a washed-out appearance. TRY IT OUT!! 7. Once you have found the specimen on Low Power (4x), center the specimen (object), then, without changing the focus knobs, switch it to Medium Power (10x).

21. Highest power lens Lowest power lens Slide Coarse Focus Fine Focus

22. 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 into detailed view

23. Magnification Power Multiple power of eyepiece by the power of the objective lens Example: eyepiece 10x lens 4x 10 x 4 = 40x the object is 40 times larger than it is using just your eye

24. 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