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2. Karatmeter - Wikipedia

   en.wikipedia.org/wiki/Karatmeter

   There are many models of Gold Purity Testing machines available - from portable (light weight) to industrial grade machines. Apart from X-ray spectrometer technique, other older traditional methods are using the TouchStone and Acid to test the gold purity. But TouchStone and Acid are destructive testing - a tiny sample of gold is cut and then ...

3. Touchstone (assaying tool) - Wikipedia

   en.wikipedia.org/wiki/Touchstone_(assaying_tool)

   This method has been used since ancient times. In modern times, additional tests can be done. The trace will react in different ways to specific concentrations of nitric acid or aqua regia, thereby identifying the quality of the gold: 24 karat gold is not affected but 14 karat gold will show chemical activity.

4. List of Historic Mechanical Engineering Landmarks - Wikipedia

   en.wikipedia.org/wiki/List_of_Historic...

   Eiffel Drop Test Machine and Wind Tunnel Most accurate to date drop-test device and wind tunnel to measure drag on falling objects of various shapes. 1903 & 1912 Paris: France ASME brochure: 238: 2006 Grumman Wildcat "Sto-Wing" Wing-folding Mechanism [5] First functional wing-folding mechanism, enabling aircraft to take up less space on ships ...

5. AOL

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   The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web.

6. Acid test - Wikipedia

   en.wikipedia.org/wiki/Acid_test

   An acid test is a qualitative chemical or metallurgical assay utilizing acid. Historically, it often involved the use of a robust acid to distinguish gold from base metals . Figuratively, the term represents any definitive test for attributes, such as gauging a person's character or evaluating a product's performance.

7. Drywasher - Wikipedia

   en.wikipedia.org/wiki/Drywasher

   Prospector operating a drywasher, called a papago. The rocks and dirt are placed in the higher compartment. Below and to the back is a bellows made of canvas. This is pumped to blow through the screening and thus blow away loose dirt while the heavy gold remains. Pinos Altos, New Mexico, 1940. A drywasher is a common desert mining tool for gold ...