Топ-10 конкурентов ad7c.com

webshed.org

This experiment uses lead, a toxic heavy metal. Several stages of the process make organic lead compounds even more toxic. Seriously, don’t mess with this stuff. It’ll fuck you up. With the warning out the way, let’s see if we can make Lead White, a heavy white pigment composed primarily of basic lead carbonate, 2PbCO3·Pb(OH)2. It was used in art from antiquity until it was first replaced by zinc white, then titanium white starting in the 19th century. Early methods of production Crude lead white can be produced by suspending lead above a pot of vinegar and allowing the acid vapours and carbon dioxide in the air to react. This is relatively slow at room temperature, and as the atmospheric concentration of carbon dioxide is low, the yield of lead white is also low. An improved method developed in the 17th century used horse manure around the vinegar-lead assembly, which provided heat from the decomposing manure and an enriched carbon dioxide atmosphere.

dhlpilotcentral.com

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dzkit.com

over the years, one by one, all the great electronic kit manufacturers have disappeared - eico, knight, dynaco, heath. perhaps the most devastating for the home electronics enthusiast was the loss of heathkit®, a mainstay from 1947 to the mid-1980's.

k4icy.com

welcome to the home site of k4icy, amateur radio operator & designer - mike maynard in panama city, florida, usa

parts.arrow.com

arrow.com is your resource for electronic component products, datasheets, reference designs and technology news. explore arrow.com today.

analog.com

analog devices is a global leader in the design and manufacturing of analog, mixed signal, and dsp integrated circuits to help solve the toughest engineering challenges.

minikits.com.au

mini-kits is australia's largest supplier of electronic kits and components to radio experimenters, engineers, and amateur radio enthusiasts.