Switchable Magnets.

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Moore

"At the same time Nicolson was producing composite crystals, Roy W. Moore at General Electric's Research Laboratory in Schenectady, NY, was working on a method to produce large perfect crystals.  Nicholson's pots look pretty unsophisticated compared to Moore's apparatus shown in Figure 017. (below) His crystals were grown within an electrically heated temperature controlled crock. In fact, the temperature was accurately controlled to within 0.1C by way of a modified mercury thermometer thermostat. His patent for the process (#1,347,350) was filed February 26, 1918 which was actually a few months earlier than Nicholson".

The large perfect "Rochelle Salt Crystal" at the bottom weighed 2 kilograms. One that size would cost $43.00 in "Potassium bitartrate" including shipping.

"Rochelle salt can be grown into large crystals and is a favorable material for scientific study.  In 1824 Sir David Brewster noticed that the crystal produced electricity when heated or what is called pyroelectricity.  Brothers Pierre and Paul Jacques Curie were the first to identify that Rochelle salt was also piezoelectric in 1880.  In other words, it generated electricity in response to being mechanically distorted.  You can imagine that heating something probably also causes it to physically distort all by itself.

In fact, Rochelle salt is orders of magnitude more piezoelectric than just about any other substance.  It remains to this day one of the most piezoelectric substances ever found.  Perhaps not surprisingly, the process works in reverse where applying electricity to the crystal causes it to physically distort".

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Taking a hint from Roy W. Moore's patent; A "Tropical Fish Aquarium Water Heater" in a double tank would keep the temperature regulated to close to within 0.1 degree centigrade for a lot less then the "Dog House Climate Controller".

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"Ebo Jager has the best reputation for aquarium heaters.  They use thicker glass, which reduces breakage.  Their heaters have a precision of half a degree Fahrenheit and are adjustable from 64 - 94 degrees".

0.1 Centigrade is 0.18 Fahrenheit. The Ebo Jager comes pretty close to that at .50 degrees Fahrenheit.

This very powerful 300 Watt Jager costs ten times less then the "Dog House Climate Control" unit. This tidy highly efficient economical little unit does practically everything Roy W. Moore's exotic patent of 1918 did for growing perfect "Rochelle Salt Crystals".


EHEIM Jager Aquarium Thermostat Heater 300W
by Eheim
$30.10

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This product is pure with no additives from Amazon. We have to start here to grow a perfect Crystal.

Potassium Sodium Tartrate "Rochelle Salt" / 4 Ounces / 99.9% Pure / USP Food Grade / SHIPS FAST FROM USA
by Loudwolf:

Price: $7.99  + $4.68 shipping

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The problem with regular aquarium heater is that that the "Rochelle Salt Solution" has to start cooling at 106º Fahrenheit, too high a temperature for the Jaeger. The "Mini Temperature Controller" is a much better solution pictured in the next post with a 0.1º sensitivity and a range from the freezing tooling of water. It's only about $20.00, all it needs is the heating element.