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Snowbird 8, lead solo Maj. Ryan Stich, and Snowbird 9, opposing solo Capt. Brent Handy, perform the inverted to inverted cross.
Pro Rider for [Blunt Scooters] Max Peters, doing an invert Air, at my local skatepark in Devonport Tasmania.
Well, this was no ordinary aqueduct. To build a ten mile long aqueduct, 55m high, would have taken vast amounts of stone, brick, money and time and the land either side of the Eurymedon River was soft and boggy, which would have led to the aqueduct subsiding under its own weight. So they built an 'inverted siphon' aqueduct.
The water supply in the hills ran out along a conventional aqueduct as far as the first tower, where it flowed into a header tank. From here, it went into pipes (made from hollowed out limestone blocks, sealed with lime and olive oil!), which descended 40m down a steep ramp to the lower level, single tier section of aqueduct, which they crossed before climbing up the second tower and ending at a receiver tank, at a slightly lower level than the header tank. From the 2nd tower (seen here), the water ran across the final, two tiered section of aqueduct to the town, with enough fall to provide some pressure.
The aqueduct was probably built in the second half of the third century and seems to have had an active life of no more than 150 years. Towers containing water tanks would have been particularly vulnerable to the effects of earthquakes.
Inverted V-ploughs are being introduced to assist in the clearance of turning lanes on dual carriageways.
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Her's an X-Ray of the insides of the alleged 1,000,000 volt spark generator that really 'only' gives about 100,000 volts. It is housed in a tube that's backfilled with potting compound so the only way to see what's inside is to wreck it with some quite nasty chemicals - or just take an X-Ray.
On the left, with three terminals, is the inverter transistor. The big squarish thing is the transformer, with the primary (low voltage) winding on the left and the high voltage winding, in several sections, on the right.
The three light patches are the middle of three high voltage capacitors. I don't know what the black blobs are (anothr X-Ray from a different angle suggests they are two-terminal devices and I guess they might possibly be spark gaps).
Below the right hand blob are two high voltage rectifier diodes. Their structure is interesting: you can clearly see that they're made from a stack of individual rectifier diodes (which are transparent to X-Rays) joined together with slivers of metal (dark). The wires leading out to the right carry the high voltage.
I think there may be a high value resistor between the two output wires - a sensible precaution, ensuring that the capacitors discharge over a reasonable period of time so that the device doesn't bite you when you pick it up six days after it was last used.
I haven't had the inclination to work out the output circuit, but it's a reasonable bet it's a simple voltage doubler rectifier. Those blobs intrigue me, though - they are impervious to my ~50keV X-Rays so I can't determine anything about their structure.
Comments are, as usual, welcome.
Model: Alexandra Lanchester
Photographer: Darren Key (Dark Lens Photography)
Clothing: Eyeball Perry Dress by Hell Bunny / Ripleys Clothing (www.ripleysclothing.co.uk)
Take a photograph of a wilting daffodil and do some interesting digital art with it.
©jackiecrossley
Davidson Ditch.
"remnants of a project undertaken during the years 1924 to 1929 to bring water to the Fairbanks area gold mining operations. The operation was carried out under the auspices of the Fairbanks Exploration Company (known locally as F.E.), a subsidiary of United States Smelting, Refining and Mining Company (U.S.S.R. & M.).
This project, known as Davidson Ditch, was a 90-mile-long conduit designed to divert water from the Chatanika River [...] to hydraulic sluicing (stripping) operations at Cleary and Goldstream, just north of Fairbanks.
The term "ditch" does not do the project justice because, although the open earthwork section comprised most of its length, the course included a 0.7 mile long tunnel near Fox, and 6.13 miles of inverted siphons along the way. (Anyone who has tried to suck gas from a gasoline tank and drain it into a bucket through a hose knows what a siphon is. It carries fluid over a high point into a lower one. An inverted siphon carries fluid across a low point--in this case, a stream bed, back to a higher one.)
The inverted siphons, which are the pipes visible today, were masterpieces of engineering at the time." Alaska Science Forum