<div dir="ltr">This is why you could find 660 watt [rated] keyless porcelain sockets at hardware stores.<div>/s/ Richard</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, May 9, 2018 at 5:44 AM, Mt. Angel Performing Arts Center via Stagecraft <span dir="ltr"><<a href="mailto:stagecraft@theatrical.net" target="_blank">stagecraft@theatrical.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
In late grade school or early high school (the timeline is a bit fuzzy) we made our own solar cells using a 'glocoil' for the heat source to diffuse silicon wafer material with various interesting (and no doubt highly toxic) doping agents.<br>
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The standard heating coils were cone shaped - this special version was tubular. As I recall it cost us an arm and a leg back then - about $6.50.<br>
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I don't recall if the solar cells we made actually worked or not - but it was fun trying.<br>
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I think I still have that same glocoil in my junk bin as it went on to a lifetime's use as a dummy load for audio amplifiers. About 16 ohms and 600 watts worth - not too shabby.<br>
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Sal Ammoniac (Ammonium chloride) was sold in a solid block (Allied Radio catalog item) as a 'tinning block' for soldering irons. Wiping a hot soldering iron across it cleaned the tip wonderfully. No surprise since it would be essentially a 'hot pickle' in Hydrochloric Acid, huh? Item is still available on Amazon and from stained glass suppliers.<br>
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And isn't 'soldering paste' ammonium chloride in petrolatum?<br>
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Carla / Stu<br>
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As an explanation for the decline in the US's tech edge, James Niccol wrote "It used to be that the USA was pretty good at producing stuff teen-aged boys could lose a finger or two playing with."<br>
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On 5/8/2018 2:14 PM, Jerry Durand via Stagecraft wrote:<br>
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On 05/08/2018 02:05 PM, Steve Boone via Stagecraft wrote:<br>
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Heating Cones were a replaceable element for a type of space heater<br>
that simply had a medium screw base socket in the middle of a shiny<br>
copper/metallic reflector. The space heaters look similar to an old<br>
table model oscillating fan, except—no blades.<br>
There is an illustration of a cone in the old 3rd edition of Parker<br>
and Smith: Scene Design and Stage Lighting. You can also still Google<br>
some pics of them.<br>
<a href="https://i.ebayimg.com/images/g/ld8AAOSwMmBVx-3U/s-l400.jpg" rel="noreferrer" target="_blank">https://i.ebayimg.com/images/g<wbr>/ld8AAOSwMmBVx-3U/s-l400.jpg</a><br>
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And here's the whole unit:<br>
<a href="https://images.duckduckgo.com/iu/?u=http%3A%2F%2Fcache.air-n-water.com%2Fimages%2Finfrared-heater-m.jpg&f=1" rel="noreferrer" target="_blank">https://images.duckduckgo.com/<wbr>iu/?u=http%3A%2F%2Fcache.air-n<wbr>-water.com%2Fimages%2Finfrared<wbr>-heater-m.jpg&f=1</a><br>
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