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Post by Jay Blair on Sept 27, 2005 15:56:23 GMT -5
Step 1 Materials required: two 2 or 3 liter soda bottles. The green tint is preffered but if clear is used the worms will not migrate into view as readily. Of course a darkened storage are is good also. Bottles must be the same size. Scissors Click on picture for full size view  |
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Post by Jay Blair on Sept 30, 2005 18:01:32 GMT -5
Step 2: Preparation. In reviewing my prototype I realized that I had used a cigarette lighter to taper shrink the open end of the worm chamber bottle. As ignition sources are a danger potential and a no-no in lower grade non lab classes , I went back to my "drawing board" to devise a safer approach. My solution was to use the scissors to cut a strip from the top the bottle I use as a catch basin and tape this as a skirt around the top I use as a fitted lid. My logic was that if the label was designed to fit around the body of the bottle , a two inch wide strip stapled and taped to the cut off lid would make a sufficiently larger coupling fitting and reduce physical injury factors during modifications of the bottles during modification into the worm bin. I apologize for not getting this down on the classroom board sooner , but before I do, I want to work out all the issues I see and let my 9 year old neighbor build one with the classroom allowed tools his school allows. 20 years of developmental engineering taught me four important principles. 1. Safety first 2. K.I.S.S. (Keep it simple stupid) 3. Prototype, then look at it from a non engineers viewpoint. 4. If a 9 or 10 year old can follow your instructions without misunderstanding them and complete the process, congratulations, the military will love your writing style  |
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