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Q: If a train of 98 cars is traveling at 60 MPH and an automobile is overtaking it at 72 MPH, will the automobile pass the train in time to line up the lead engine with the mountains behind it and get the classic yellow train engine/New Mexican landscape/perfect-clouds-in-the-sky backdrop photo?
A: Yes. And at the decisive moment, there will also be a perfectly placed blurry telephone pole to ruin the shot. So here's a "window rolled down at 72 MPH, sitting backwards with back pressed against the dashboard leaning out the window shooting the train which is now sliding back into the distance" shot to kick off the Spring Break 2010 set.
Boragó
Avenida Nueva Costanera 3467
Vitacura, Santiago, Chile
Rodolfo Guzmán, Chef/Owner
Dinner: À la Carte
March 18, 2014
Near the end of the main pipe line in the storm drain called Nugg's 'Ole, the pipe start to get a a lot smaller and rougher and they are very hard to move through
This is a nice example of how the 300 mm focal length compresses perspective. There are a couple of kilometers between where I stand and the most distant buildings.
ISO 400, 1/125 sec, f/2.0. Canon 100mm f/2.0 LTM on Epson R-D1s.
Imaged rotated. Perspective corrected. Auto level correction. Sharpened and cropped. All done on Adobe Photoshop CS2.
EPSN2771E
Cylinders of purified air and nitrogen are needed for several aerosol sampling instruments and helium is needed for weather balloons.
Terms of Use: Our images are freely and publicly available for use with the credit line, “Image courtesy of the U.S. Department of Energy Atmospheric Radiation Measurement (ARM) user facility.”
Sons & Daughters, Union Square, San Francisco
August 1, 2011
708 Bush Street
San Francisco, CA 94108
+1 (415) 391-8311
Why it works.
Steam in the top, compressed air out of the bottom. Dual action piston on top cycles automatically with a "Shortend Stroke" valve (that's the small rod in the center) to drive the main rod that compresses atmospheric air, intake from a filter, to a pressure vessel (tank) to maintain the brake line pressure. If the line is dumped, or slowly released, springs on each car in the train no longer hold the brakes away from the wheels, which apply the brakes until line pressure is restored, releasing the brakes by overcoming the springs. Each brake shoe is balanced in equilibrium with all the others, applying exactly the same dynamic pressure evenly along the entire train. There are many ways to compress air, this is the most common on steam locomotives.
Identical pumps can also be used to compress feed water into the boiler, so often there will be two compressors on the fireman's side of the engine. One to maintain the boiler water level and one to maintain the brake system air pressure.
Why not just use steam pressure? Steam pressure changes depending on the load of the locomotive and this isolates that variability. But more importantly, steam condenses into water when cooled, taking up less volume -decreasing the pressure - applying the brakes, and worse is the maintenance nightmare of water rusting the interior of the brake system parts. The moisture in the air, when compressed, precipitates out and is caught in the first pressure storage tank, which is why one finds a drain valve at the bottom of it.
[#Beginning of Shooting Data Section].Nikon D80.
Focal Length: 300mm.
Optimize Image: Custom.
Color Mode: Mode IIIa (sRGB).
Long Exposure NR: Off.
High ISO NR: Off.
2007/07/28 13:37:05.5.
Exposure Mode: Aperture Priority.
White Balance: Auto.
Tone Comp.: Normal.
Compressed RAW (12-bit).
Metering Mode: Center-Weighted.
AF Mode: AF-C.
Hue Adjustment: 0°.
1/60 sec - F/8.
Flash Sync Mode: Front Curtain.
Saturation: Normal.
Color.
Exposure Comp.: -0.7 EV.
Auto Flash Mode: Built-in TTL.
Sharpening: Normal.
Lens: VR 70-300mm F/4.5-5.6 G.
Sensitivity: ISO 100.
Image Comment: (C)ROBERTGRANTMYRE .
[#End of Shooting Data Section].