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How far is the focal point from the mirror?
"Joule Thief" circuit in a Flashlight Bulb? Yes!!!
Basic Joule Thief Flashlight
Have you plugged this into a battery power pack like for charging phones? Do you have any runtimes for different milliamp hour battery packs?
Have you plugged this into a battery power pack like for charging phones? Do you have any runtimes for different milliamp hour battery packs? Is this using 350ma per hour?
USB Heater (or How to Upgrade Your Coffee Cup)
Making A Simple Joule Thief (made easy)
Make A Joule Thief Coil Without A Ferrite Toroid
You could try a pre-made board <a href="http://www.ebay.com/itm/5V-Mini-USB-1A-Lithium-Battery-Charging-Board-Charger-Module-3285-/201644477771?hash=item2ef2f28d4b:g:5OkAAOxyjxlTMWrw">like this</a> on Ebay or Amazon.
Or use the Inkbird temperature monitor with external probe. I like mine. https://smile.amazon.com/Inkbird-Temperature-Fahre...
On one of your pictures near the top of this 'ible it looks like a circuit with a pre-made joule thief on it. Do joule thieves come pre-made? I'm having trouble finding spare parts to make one. I just don't have a lot of parts laying around.
There are pre-made dc-dc step-up convertors with a USB port already on them. Try this one: http://www.ebay.com/itm/291528517571?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT. Input voltage is 0.9v to 5v, output is 5vdc. Easy peasy.
Thanks! Good to know. There are several more plagues after the 1349 one. One in 1665, followed by the great London fire of 1666.
Probably not true. I've read 2.5 books on the plague of 1347-1349 (the main plague that killed 30% of Europe on average) with many sources of people who were there from 1347-1349, and no glass was mentioned in these masks. Glass was very expensive in those days so it was not likely used. They did put herbs in the beaks because they thought it kept "ill vapors" away.
Free EPUB books on the plague here: https://goo.gl/3QdCHq
I sit 2 ft from flowers where bees (and wasps) are gathering pollen or nectar. I didn't know there were wasps that gathered nectar. I never have a problem with them getting aggressive. Except the leaf cutter bees are very curious and will sometimes zip once around my head. Then they are satisfied I'm not a giant bee and I'm not trying to take their territory. Leaf cutters can get in quite a scuffle over a blooming sunflower though! lol.
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