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Capturing
the Elusive Green Flash by Steve
Cullen
After trying to capture the elusive
"green flash" for many years, I was
finally successful on a trip to Hawaii in mid-October
2005. In fact, I was able to capture not just
a single image (Fig. 1) but a 10-frame sequence
(Fig. 2) showing the flash from beginning to end
over a 5-second period.
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In 1992 and 1994 two discoveries
were made that have had a major impact on the
scientific community. These finds, the Schaefer
and Hebior mammoths, were discovered and excavated
in Kenosha County, Wisconsin, through the efforts
and skills of a number of individuals. More. |
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How
to Prepare
Abrasive Powders
Alvaro Amaro de Azevedo
Arrange about 200 g of washed
dried sand and put it in a ball mill (see here
or search here).
Let it crush for one hour or so and then transfer
the flour to a 200 ml glass.
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