Microscope

For those people in Mrs. Henry's 04-05 class, this is a familiar model. I don't like it so much (because this is not what a real microscope looks like) but my mom likes it. Ironically it got me a hundred on my science project.

This model does everything a real microscope can do except magnify. the body tube moves up and down and there are actual fine and coarse adjustment knobs. These knobs move the body tube at different rates. The fine adjustment knob moves the tube through gearing but the coarse adjustment knob is a large gear that turns the fine adjustment knob many times. There are stage clips and nosepiece work as well. I solved the problem of a sliding body tube by using a worm gear (this allows high-torque output from one end but not input from that same end). Therefore the body tube only moves through the input of the knobs and not gravity. Furthermore, the rack and pinion arangement I used were also essential because it converts rotational movement into lateral movement. There is a closeup on the worm gear and rack and pinion gear above.