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A LEGO Technic working microscope using a water drop for magnification, with dual light with down shutter.
How it works
The basic functioning uses water drop located on the lens panel. Its causes a magnification of the sample in the light tunnel using the diffraction of the water drop. The magnification adjustment knob operates a worm screw gearing which makes the light tunnel and lens panel go up and down. It is used to set the focus and set the magnification, the more the tunnel is up, the more is the magnification, but the more is the visual sample deformation on the ends of water drop.
The lower and upper light are here to illuminate the sample. The upper light to illuminate the sample and the lower to see the edge. The lower light is very useful with transparent sample (like plant leaf, sugar or fabric) because it makes more brightness to the sample and its edge. But it is useless with solid sample, that is why there is a light shutter to shut the lower light. The maximum magnification is about x5, but it depends of the height of the water drop. That is why I advise you to use cold water with no impurities and try to make the bigger water drop in order to have best magnification. Check the picture below to see the effect of magnification on sample and deformations which occur.
How to build ?
The PDF instructions can be downloaded for free on this shop, here is the partlist in the preview below :
Some advice to have good magnification :
- Have the glasses clean (up and down)
- Have a charged battery (to have the maximum of light)
- Use flat sample in preference
- Try to make the bigger water drop
- Use cold water for the water drop
- Limit the impurity in the water drop
- Set the water drop on the center of the light tunnel
About this product
All, Free, Machine
|Bill Of Material|
PDF Instructions (15 pages / 6mo)