OUTXPRO Solar Energy Snake Repeller Powerful Ultrasonic Gopher Mole Mouse Rodent Voles Rat Yard Lawn Farm Garden Pest Repellent Device w LED LightSolar Powered Snake Repellent to Secure your Living Environment Read instructions emailed to you thoroughly. The repeller transmits its signal in all directions approx. 50 ft so they can be placed approx. 100 ft apart in high risk areas, it is always recommended to use two or more units to get the best results. Insert the spike into the ground paying attention not to damage the unit. The spike should be firmly planted while leaving the base of the head 1-2" above the ground. We suggest use a crowbar to first make a small hole and gently push the ...
Even as concern over climate change and energy security fuel a boom in solar technology, many still think of solar as a twentieth-century wonder. Few realize that the first photovoltaic array appeared on a New York City rooftop in 1884, or that brilliant engineers in France were using solar power in the 1860s to run steam engines, or that in 1901 an ostrich farmer in Southern California used a single solar engine to irrigate three hundred acres of citrus trees. Fewer still know that Leonardo da Vinci planned to make his fortune by building half-mile-long mirrors to heat water, or that the Bronze Age Chinese used hand-sized solar-concentrating mirrors to light fires the way we use matches and lighters today.With thirteen new chapters, Let It Shine is a fully revised and expanded edition of A Golden Thread, Perlin’s classic history of solar technology, detailing the past forty years of technological developments driving today’s solar renaissance. This unique and compelling compendium of humankind’s solar ideas tells the fascinating story of how our predecessors throughout time, again and again, have applied the sun to better their lives and how we can too.