Why everyone should get a Fresnel Lens
We had 5 days without electricity in August-September 2011, from Hurricane Irene. Living without electricity would have been bearable, were it not for the lack of hot water. Of course I built fires, first from wood, then I got some charcoal, and life got much better. Life without heat and hot water really really sucks.
One thing I did immediately was get a Sun Oven, but that is really just a toy. I recently ordered a Fresnel Lens. When I get it, I will make a youtube video to show my results, but here are the specs:
* SIZE—————–18H X 18W
* POWER EST.———–6.8
* BEAM SIZE MAX POWER–.4 INCH (2.7″ OUTER AREA 900 F)
* FOCAL LENGTH———26 INCHES
* WEIGHT ————–12 LBS.
* MAX TEMP. CLIMB——900 F IR THERMOMETER
* MAX COLLECTION——-1100F MATERIAL EST………..
* MATERIALS TESTED
* WATER————12oz. BOILS 120 sec.
* WOOD————-FLAME .1 SEC.
* ZINC————-MELTS .5OZ 14 GRAMS – 15 SEC. * 3.1 GRAMS – 11 SEC.
* GLASS————MELTS 1″ X 1/4″ BROWN GLASS 21 SEC.
* CONCRETE———GLOW 25 SEC. EXPOSURE, MELT 40 SEC.
My initial, pre-doom use for it will be to boil LOTS of water, to pour the water on weeds. A big problem I have encountered is that weeds are a massive force of nature, like a Tidal Wave or a Hurricane. From June to August, weeds grow with incredible force and density. However, boiling water actually kills them quite nicely.
Post doom, hot water is going to be a hot item. Water obtained from ponds/lakes/rivers needs to be boiled thoroughly. Microbes in surface water can kill you, and if there is a collapse, people will get lazy and not boil water and die from drinking untreated surface water. This is what studies by the US Civil Defense Agency found. Human nature leads to lazy water drinking habits and people die from water based pathogens. You want to be able to produce as many gallons of potable water a day that you can, as well as bath water and cooking water.