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This is a pinhole viewer. It is possible to use it to project an image of the Sun (or a bright light source) anytime. The hole shape does not affect the image. if the hole is small enough the image you get is of the light source. When…
I've tried several sites to generate my own topographic maps including, but not limited to: TopoTopo (now defunct) and Terrain2STL , but they never had much detail and could be hard to pinpoint precise locations and could be vague on the…
Vernier's oxygen gas sensors have to be stored upright and are designed to store in the square 250 mL Nalgene bottles they come with. I've found that they're a little top heavy and tend to topple or just get bumped around my shelves. So I…
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