Fresnel Lens vs. a Penny, Part Two
Finally had a nice sunny day to try out the fresnel lens I pried out of the old big screen television the other day. First observations…. very glad to have welding goggles on hand;...
Finally had a nice sunny day to try out the fresnel lens I pried out of the old big screen television the other day. First observations…. very glad to have welding goggles on hand;...