You can use your engineering knowledge for most nefarious purposes. -Prof. PK
Sunday, November 26, 2006
Thursday, November 16, 2006
Mother McGee went to drive C:
to find her poor Windows a byte
But, when she enquired, all drive space expired
And not even Stacker would put it right.
I'm out of commission tonight because I'm hooking up my replacement hard drive and trying to transfer all of my files. Wish me luck.
Wednesday, November 15, 2006
Lies, Damn Lies, and...
It's hunting season, so I'm using that as a flimsy excuse to post this joke.
Three statisticians went deer hunting.
They spied a deer in the woods. The first statistician shot, and missed the deer by being a foot too far to the left. The deer was alarmed but froze in place, giving the second statistician a shot. He missed the deer by being a foot too far to the right.
The third cried, "We hit it!"
Tuesday, November 14, 2006
If you haven't checked Mr. Completely's blog lately, then look at last weeks's post on the Tacoma Narrows Bridge.
I like to think I have some nice photos but these are great!
Sunday, November 12, 2006
Quote of the unspecified temporal interval
My doctor told me to stop having intimate dinners for four. Unless there are three other people.
Saturday, November 11, 2006
Today I thought it would be appropriate to share the rest of my pictures from the last trip to Australia. These didn't really fit with the mood of the other pictures, but now that it's Armistice Day (Veterans day if you prefer the new label) I think it's time to share these pictures.
Just a mile or two away from Flinders Street station, located in a large park where the bustle of the city seems to disappear, you will find the Shrine of Remembrance.
The shrine was built between 1928 and 1934. It's original purpose was to show gratitude for the thousands of Victoria residents who served and died in 'The Great War.' As time marched on and the war of 1914 became known as World War I (thanks to the dawn of World War II) the shrine came to be a memorial for all who served in the armed services. More conflicts and places were carved into the stones of the shrine, and other memorials were erected for various conflicts and branches of the armed services.
The shrine is open to the public from 10 to 5 every day except Good Friday and Christmas so that anyone can tour the grounds and the interior of the shrine itself. A long walk up the steps in front will lead you to this quiet sanctuary.
Along the walls of the sanctuary you will find images of soldiers in action during WW I carved into the stone walls. In the middle of the room is a stone, set in a recess in the floor, with a brief inscription. Every year on November 11 at 11AM, a point of light from the skylight above moves across the stone and highlights the word love.
Below the sanctuary is an even more somber feature of the shrine; the crypt.
The walls are lined with bronze tablets listing the military units involved in the great war and all around the ceiling hang the regimental colors of these units. The feature in the center of the room is the father and son statue, placed there to honor two succeeding generations of Victorians. The inscription below reads,
THESE FIGURES OF FATHER AND SON HONOUR THE COURAGE AND SACRIFICE WHICH LINKS TWO GENERATIONS OF VICTORIAN SERVICE MEN AND WOMEN WHO SERVED AND DIED IN THE WORLD WARS 1914-1918 AND 1939-1945
I could say more, but you would learn more by visiting the shrine's website and reading more about it there. And I hope, as you read about the shrine and look at the photos that you can take a moment to think about the sacrifices made by the men and women of the armed services around the world.
Labels: Travel Australia
Tuesday, November 07, 2006
I mentioned in my 'Powerhouse' post that steam power helped to free people from the restrictions of the waterwheel. Recently I had the opportunity to visit a site where the power of water was very successfully utilized for many years. So successfully in fact, that it was being used past the heyday of
the stationary steam engine.
The Aldie Mill was constructed in the early 1800s, and was soon followed by a town bearing the name of Aldie Virginia. The mill would buy local grain crops and grind them into meal and flour, or grind grain for the farmer himself for a fee (which was usually a percentage of the grain.) Since the area relied heavily upon agriculture, the mill eventually became quite a success. So successful in fact that it did not close until 1971 after being owned by six generations of Moore family.
What makes this mill a little unusual is the waterwheel, or rather, waterwheels.
Unlike many mills, this one had two waterwheels instead of just one. This gave the miller more power at his disposal. At one point the mill was operating 5 grist mills at the same time. But before I get too far ahead of myself let's take a moment to look at the process from the beginning.
When you want to use a waterwheel what's the first thing you need? Water of course.
This mill pond has been consructed along the course of a small waterway, so that a sizable quantity of water can be stored.
A wooden gate limits the flow of the water so that the mill can be shut off. In this case the gate is mostly hidden because the pond is full and running over the stone spillway. From there, the water flows down a pipe to one of two control gates which allow individual control over each wheel. I suspect these are more recent than the mill itself, but they still aren't new.
Inside the mill, the miller opens the control gates to start the waterwheels. These monsters (approximately 18' in diameter) are so heavy that it's necessary to fill 3 of the troughs before you see any rotation. A large shaft runs through the wall of the mill, connecting the waterwheel to one of the large gears inside which turns a gear on the shaft connected to one of the mill stones.
These gears probably replaced a system of wooden cogs with a similar configuration.
Up above that last picture you will find this, the center of activity.
Here, the miller would load grain into the hoppers, either manually from sacks, or by use of the mills built in elevator system, which was capable of conveying grain between all three floors of the mill. The mill would be fed through a hole in the center of the upper stone, and then crushed between the two stones.
This was accomplished by means of multiple grooves cut into the face of the stones. These grooves create a scissors like action which actually cuts the grains. Typically these grooves can also be shaped to limit the travel of the grist so that the smaller particles travel toward the outer edge of the stones. In this case, the stones were quarried in France and shipped, in multiple pieces) the the united states where they were assembled and held together by a large iron band.
The fine particles which escape from the stones, now meal or flower, are funneled down into the basement where they can again be conveyed upstairs. When the grinding is complete, the flour or meal is then conveyed through this hollow beam to the granary next door for storage and sale.
One of the fascinating things about this mill is that it has, at some point, been refitted with newer equipment. So far, the equipment has been directly driven from shafts and gears. A line shaft type system was also used.
Here you can see the input from the other waterwheel, which is conveyed, by a set of gears to the large pulley seen peaking out of the hole in the floor in the phot below.
That pulley would have a large belt on it which would be used to turn another, smaler pulley. The smaller pulley would be connected to a large shaft or set of shafts with multiple pulleys and belts for running various machines around the mill. In later years, this would have served a set of roller style mills similar to these.
These roller mills provided a more efficient system of grinding because rather than using large, heavy rotating parts to grind the meal all at once, the roller mills use small, high speed rollers to cut and crush the grain. This is done in multiple stages rather than trying to do the work all at once as was the case with stone grinding.
The Aldie Mill eventually succumbed to the ravages of time. For a while it was kept running by using a tractor to drive the line shaft system, but it would have been impractical to continue running the equipment in such a manner. The site has now been restored so that the mill is partially functional.
It is open on the weekends for tours, and occasionally it is run for the enjoyment of the visitors.
Labels: Old Technology
Sunday, November 05, 2006
Scenes from the Shenandoah Valley
More about this later
Labels: Travel - Virginia