alphydan's instructables
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Earned a bronze medal
Contest Winner
Second Prize in the
Outside Contest 2016
Contest Winner
Runner Up in the
Outdoor Cooking Challenge 2016
- alphydan's entry Cooking at 350ºF with the sun (Fresnel cooker from scrap) is a winner in the Outside Contest 2016 contest
Winner!
- alphydan commented on alphydan's instructable Cooking at 350ºF with the sun (Fresnel cooker from scrap)
- alphydan's entry Cooking at 350ºF with the sun (Fresnel cooker from scrap) is a finalist in the Outside Contest 2016 contest
Finalist
- alphydan followed The Oakland Toy Lab
- alphydan commented on alphydan's instructable Cooking at 350ºF with the sun (Fresnel cooker from scrap)View Instructable »
Nice! How do you adjust the height of the focal point?
- alphydan's entry Cooking at 350ºF with the sun (Fresnel cooker from scrap) is a winner in the Outdoor Cooking Challenge 2016 contest
Winner!
- alphydan's entry Cooking at 350ºF with the sun (Fresnel cooker from scrap) is a finalist in the Outdoor Cooking Challenge 2016 contest
Finalist
- alphydan commented on alphydan's instructable Cooking at 350ºF with the sun (Fresnel cooker from scrap)View Instructable »
@karlbamforth, you are absolutely right. Safety with the lens is very important. We made sure hands were off the area of focus when it was working (some of the pictures are with clouds, or pointing in a different direction). But when adjusting the pan we wore some thick welding gloves.
- alphydan entered Cooking at 350ºF with the sun (Fresnel cooker from scrap) in the Outside Contest 2016 contest
UV rays will bend slightly more because of dispersion (colours with a higher frequency will refract with a bigger angle). This could mean that UV rays are less focused at the visible focal point (but the difference is likely small).