California Stamps - a photo on Flickriver

California Stamps

            These stamps are for crushing ore to help extract the minerals.  Cornish stamps are square, but California Stamps are round.  As the waterwheel cam raises and drops the stamps, each one is given a rotation.  This evens the wear on the stamp head, and can produce 50% more throughput compared to the non rotating Cornish stamps.  I suspect the California Stamps were first introduced during the California Gold Rush of 1849.  
If anyone is thinking of starting to collect stamps, they should be warned that they can weigh up to 200kg each.
These stamps were photographed in operation at the Kelly Mine on Dartmoor.  The Kelly Mine produced micaceous iron oxide, otherwise known as "shiny ore".  This was much used in anti-rust paints.
   

Taken on: September 4, 2016

Tags:

California Stamps

ore crushing

49er

Kelly Mine

iron ore

anti-rust paint « less

Sets appears in: • East Dartmoor

Camera: Panasonic DMC-GX7, f/3.5, 1/25 sec, 14mm (=28mm), ISO 1600 (more info) (hide info)

Camera:	Panasonic DMC-GX7
Aperture:	f/3.5
Exposure Time:	0.04 sec (1/25)
Focal Length:	14mm (35mm equivalent: 28mm)
ISO:	1600
Exposure Bias:	0 EV
Flash:	Off, Did not fire
Exposure Program:	Aperture-priority AE
Exposure Mode:	Auto
Metering Mode:	Multi-segment
White Balance:	Auto
Gain Control:	High gain up
Color Space:	sRGB
Software:	Adobe Photoshop Elements 10.0 Windows
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