What bent-wire device helped Britain’s Gem manufacturing mine office-supply gold, in the early 1900s?
103959
That would be the paper-clip.
34001
See this site:\nhttp://museum.woolworths.co.uk/1910s-wwbuilding.htm
664766
1944 copper wheat penny I think.
295870
The mining history of Colorado.  Gold and silver mining was key to the pioneering of the Colorado rocky mountains and the settling of Denver.\n\nNuggets...of GOLD, of SILVER\n\n***Wait... was that even what you were asking?
227718
to my surprise, there appear to be many sites that sell such equipment; check it out:\nhttp://www.google.com/search?client=safari&rls=en&q=vacuum+bellow+gatan+ion+mill&ie=UTF-8&oe=UTF-8
780548
Normally wire-size measurements are in millimeters and gauge. It will be easier for you to communicate with who you are ordering from if you do the computations to change it to millimeters and then transfer that to gauge of wire.\n\nI suggest you go to a refiner like David Fell & Co. (see link below.) The should be able to supply you with any gauge wire in gold that you need.
531203
prooly need ifrared thingy\ntry a industrial magnet
576940
try a coin dealer, or a Jewlery store, arts and craft metalsmith shop
729668
Miners used mercury (quicksilver) to recover gold throughout the western United States at both placer (alluvial) and hardrock (lode) mines. The vast majority of mercury lost to the environment in California was from placer-gold mines, which used hydraulic, drift, and dredging methods. At hydraulic mines, placer ores were broken down with monitors (or water cannons, fig. 1) and the resulting slurry was directed through sluices and drainage tunnels, where gold particles combined with liquid mercury to form gold-mercury amalgam. Loss of mercury in this process was 10 to 30 percent per season (Bowie, 1905), resulting in highly contaminated sediments at mine sites (fig. 2). Elevated mercury concentrations in present-day mine waters and sediments indicate that hundreds to thousands of pounds of mercury remain at each of the many sites affected by hydraulic mining.\n\n\nhope that helps
1025771
In 1906 the American physicist Lee De Forest invented the vacuum tube triode which was the first three terminal device and enabled amplification and switching of electrical signals
844643
Stillwater in Montana USA\nhttp://www.mining-technology.com/projects/stillwater/
621703
CNC Glass Cutting Machine.\n\nYour question is a little broad, that is a full time job.
890398
Early in the 1900's (circa 1917) precision curved glass tubes filled with a damping liquid and steel ball were introduced to provide accurate visual angle indication.
130295
:) henry ford invent it in the 1900s
1178634
A ductile substance is easily pulled or stretched into a thin wire without breaking.\n\n"...gold is the most ductile metal and one gram of it can be drawn into a wire 2,300 meters long."\n\n"The order of ductility of some familiar metals is gold > silver > platinum > iron > copper > palladium > aluminum > zinc > tin > lead"
20778
The basic rule of thumb is any metal.  Silver, gold, iron, copper, and aluminum are a few examples.  Copper is commonly used in electrical wiring because it is durable, inexpensive, and easy to bend.  \n\nAs previous stated, the "gold connectors" on your cables provide very little help.  In pure definition, they conduct electricity more efficiently than copper.  However, the cost delivers little results unless you are investing $50,000 in your home theater sytem.  Then you might tell a difference.\n\nHope it helps!
252020
From wikipedia:\n"a mythical substance that supposedly could turn inexpensive metals into gold and/or create an elixir that would make humans younger"