+- +-

+-User

Welcome, Guest.
Please login or register.
 
 
 
Forgot your password?

+-Stats ezBlock

Members
Total Members: 52
Latest: Carnesia
New This Month: 0
New This Week: 0
New Today: 0
Stats
Total Posts: 16222
Total Topics: 264
Most Online Today: 3
Most Online Ever: 201
(December 08, 2019, 11:34:38 pm)
Users Online
Members: 0
Guests: 0
Total: 0

Author Topic: Homebody Handy Hints  (Read 3889 times)

0 Members and 0 Guests are viewing this topic.

AGelbert

  • Administrator
  • Hero Member
  • *****
  • Posts: 33007
  • Location: Colchester, Vermont
    • Renwable Revolution
Giant Fresnel Lens Deathray: An Experiment in Optics
« on: May 03, 2014, 03:00:02 pm »
Giant Fresnel Lens Deathray: An Experiment in Optics

Quote

So you don't have access to your own rail gun or military space laser....but never fear, we'll use the 1000 Watts/m2 of free sunlight in your backyard!! But how?  ???

....A 13 square foot magnifying glass!  ;)

Seriously. A solid glass lens that size would be silly, but instead we can use a 4 foot wide Fresnel lens. You know, those clear, flat things with the ridges, you find them on overhead projectors and rear windows on some buses? The idea is pretty simple: a Fresnel lens is just a normal curved lens chopped into thousands of little rings, but just as effective
.



http://www.instructables.com/id/Giant-Fresnel-Lens-Deathray-An-Experiment-in-Opti/

Agelbert NOTE: Persons lacking knowledge of light concentration physics that assume industrial civilization requires fossil fuels for manufacturing of any and all metal alloys, glass, plastics, insulation, bricks, fiber optics, reflective film, mirrors, solar cells, wind turbines or WHATEVER will find the article depressing.   
Rob not the poor, because he is poor: neither oppress the afflicted in the gate:
For the Lord will plead their cause, and spoil the soul of those that spoiled them. Pr. 22:22-23

 

+-Recent Topics

Experts Knew a Pandemic Was Coming. Here’s What They’re Worried About Next. by Surly1
May 12, 2020, 07:46:22 am

Doomstead Diner Daily by Surly1
May 12, 2020, 07:40:17 am

Profiles in Courage by AGelbert
May 09, 2020, 11:47:35 pm

Money by AGelbert
May 09, 2020, 11:27:30 pm

Creeping Police State by AGelbert
May 09, 2020, 10:35:38 pm

COVID-19 🏴☠️ Pandemic by AGelbert
May 09, 2020, 10:19:30 pm

Resisting Brainwashing Propaganda by AGelbert
May 09, 2020, 10:07:28 pm

Corruption in Government by AGelbert
May 09, 2020, 09:54:48 pm

🚩 Global Climate Chaos ☠️ by AGelbert
May 09, 2020, 09:10:24 pm

Intelligent Design by AGelbert
May 09, 2020, 06:38:41 pm