This lens is used to direct boil water. The Fresnel side always faces the sun for maximum power. [ Ссылка ]
WATCH IN HD NICE BOILING TEA. This is a video shot on a chilly 27 degree morning. The starting water temperature was 60 and the wind was mild. The Fresnel Lens is a 35" x 47" Spot Lens unframed. It is roughed up from years past and never was extremely transparent to start with. It has an 80% light transfer . The start to finish time was 3 minutes of 16 oz water. The clear glass enabled the light to heat the surface of the tea roots and leaves. This is Loquat, small quantities has extremely high in antioxidant. The root is coated with Resveratrol. The light destroys much of it but you can still get benefits.
We have over 100 mature fruit bearing trees.
