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Water-based Varathane is one such product it costs about $23 for a quart can (enough to cover three evapotrons). The finish I use is a water-based exterior polyurethane with a matte or satin finish (non-glossy).
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Your evapotron will last years longer if, before it's assembled, every wood part is sealed inside a plastic skin. The desert is tough on wood, especially end grain and plywood edges. 8/14/13, 8/14Ī coat of varnish on wood parts will greatly extend their lifetimes. Please visit, which contains discussions, workshop dates, and other useful information. Many of the illustrations have not yet been revised to match. Further Information This guide has recently been revised to correspond to construction improvements and simplifications.
CONTRAPTION MAKER PAPER PREPARATIONS FULL
The construction time is one full day, less if you have friends helping. Alternatively, join one of our one-day construction workshops, where we provide most of the parts at cost (around $75 including bike wheels) and the wood parts are precut.
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Materials cost varies, depending on what you have on hand, up to about $225.
CONTRAPTION MAKER PAPER PREPARATIONS PLUS
It uses common tools that are probably in your garage or shop, plus two or three you might want to buy.
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Time and Money On your own, construction takes about a day or three. If thinking about this makes you want to wash your hands, do it. The subassemblies you take home are unsanitary too but so is a handshake, or sharing eating utensils. Step 32 describes periodic disinfection with chlorine bleach. A word of caution While you're enjoying watching and using your evapotron, keep in mind that graywater is unsanitary and can be hazardous to your health. With a water-spray cleaning, another old towel and a new plastic liner, your evapotron should be ready to go next year. As you prepare to leave the playa you dismantle it again, then lift the muddy plastic liner from the tray and dump it into your trash bag. There, setting it up and putting it into operation takes under an hour. During construction, you will assemble a complete evapotron (except for the black plastic tray liner and the panty-hose filter.) Once you've tested it in some wind, and it works, you can dismantle it (dismount the propeller and masts, and collapse the drum) for transporting to the playa. There are five subassemblies: the tray, two masts, the drum, and the propeller. The (almost always) excess capacity lets you offer graywater disposal to nearby camps, forming a neighborhood center the way village wells have done for millennia, only backward. It's useful, and it's attractive! The flashing propeller blades and the slow-moving drum catch people's attention. Dust just washes off the Gray-B-Gon's drum, in a single rotation. Don't try this at home.) The rotating drum design avoids two performance killers of passive evapotrons: loss of wick absorbency, and reduced performance due to accumulated playa dust. (Maximum measured: 2 gallons per hour in high wind. With typical winds, it evaporates or disperses fifteen to twenty gallons of water a day. (Except for what belongs in a porta-potty.) Burners dispose of their graywater in many ways, from "pack it out" to black-plastic-lined evaporation ponds to fullblown water-purification systems designed by professionals (who make coffee using their secondhand water!) This device, the Gray-B-Gon evapotron, is the result of many years of using and improving. It will eliminate, legally and responsibly, all the wastewater produced in a medium-size camp, or several small camps. You can use as many objects as you like, but your simulation should consist of no less than 5 objects.Here is a wind-powered graywater evaporation device for your Burning Man camp. The balls are then delivered to the end of the conveyor belts before they are pushed into their packaging boxes. Next, devise the gear and motor mechanism so that when the motor starts, all the three conveyor belts move together. The first conveyor belt consists of three basketballs, the second belt comprises three baseballs and the third belt consists of three bowling balls. To develop the scenario, you can place three conveyor belts on the stage. Your objective is to devise a delivery system using motor, gears and conveyor belts to deliver and package three types of newly manufactured sports balls into their respective packaging boxes. After these balls are manufactured and inspected, they are delivered via conveyor belts for packaging in boxes before being shipped out to their customers. Choice #3: A certain manufacturing plant makes sports balls such as basketballs, bowling balls and baseballs.