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Supersize it



Comments made by the photographer

Submitter's name: Gregg Iverson
Title: Supersize it
Gear used: OM 4T with 35-70/3.5-4.5 lens and T20 flash set on auto. Scanner data unknown.
Diaphragm: f16
Shutter speed: Automatic but no faster than 1/60 of course.
Film used: Kodak Portra NC160 developed and scanned at Walmart
Technical information: Straight shot putting as much room as possible (about 9 ft) between myself and the hats. The shaft is not moving. Made a mask in Photoshop of the overlit foreground. Lightened the background and darkened the foreground as much as possible then flattened the image.
Subject information: I was invited on my son's High School physics fieldtrip. We are standing inside a pump motor/generator looking at it's main shaft. The turbine is below us two stories and the motors are several stories above us. This is one of 8 all lined up in a 6 story space blasted out of rock 860 feet below a water-filled reservoir. Water is pumped up a 12 foot pipe into the reservoir when electrical demand is low, then flows back down the shaft past the turbine during the day when demand is high. The procedure for starting the turbine is quite involved as the water is at 600 psi and the electricity from each turbine has to be in phase with the power grid. If there had been a pinhole leak, the water at that pressure would have cut through the pipes, a break in the system and the 6 story building would have filled with water in under 10 seconds.
 

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