DPChallenge: A Digital Photography Contest You are not logged in. (log in or register) 
 
Challenge Entries
Portfolio Images
Physics lecture #87 - Barlow's Wheel
Physics lecture #87 - Barlow's Wheel
vawendy


Photograph Information Photographer's Comments
Challenge: 100 Years Old (Advanced Editing VII)
Collection: 2009 Challenges
Camera: Canon EOS-40D
Lens: Canon EF 50mm f/1.4 USM
Location: Williamsburg, VA
Date: Mar 5, 2009
Aperture: f5
ISO: 100
Shutter: 1/250
Galleries: Still Life
Date Uploaded: Mar 8, 2009

 From the collection of a physics professor at William and Mary

The spinning object is called Barlow's Wheel or, in French, "Roue de Barlow" It is probably the earliest example of an electric motor. A puddle of mercury at the lowest point of the wheel completes the circuit through one spoke at a time. The flat horseshoe magnet provides the magnetic (V X B) force. I think it is about 1870.

Statistics
Place: 60 out of 184
Avg (all users): 5.7602
Avg (commenters): 7.5000
Avg (participants): 5.6528
Avg (non-participants): 5.8384
Views since voting: 2785
Views during voting: 280
Votes: 171
Comments: 10
Favorites: 0

Please log in or register to add your comments!

AuthorThread
 Comments Made During the Challenge
03/15/2009 05:37:10 PM
I like the way the shadow looks like a man with a wheel.
  Photographer found comment helpful.
 03/15/2009 12:23:35 PM
//www.magnet.fsu.edu/education/tutorials/java/index.html

Thanks for posting this.
  Photographer found comment helpful.
 03/14/2009 12:41:40 AM
Beautifully photographed to make use of the shadow.
  Photographer found comment helpful.
 03/12/2009 09:56:13 PM
Very nice shadow effect.
  Photographer found comment helpful.
 03/10/2009 02:02:01 PM
I'll have to go look up some info on what this is. Looks interesting.
  Photographer found comment helpful.
 03/10/2009 02:27:59 AM
Wonderful shadow. Very interesting and intriguing object. The surface is a little buckled so it's a little distracting, as are the creases at the curved edge.
  Photographer found comment helpful.
 03/09/2009 11:47:30 AM
Excellent photo of a 19th century invention. Well done, especially the shadow. 9
  Photographer found comment helpful.
 03/09/2009 09:25:50 AM
You have managed to avoid what a lot of the other shots in this challenge have suffered from and that is ending up with a photo which simply documents the item. You have a great use of shadow and lighting here, which compliment what is already an interesting (and unusual) object. I don't know what this is, but I can only assume it's part of some light experiment. 8 from me.
  Photographer found comment helpful.
 03/09/2009 09:24:17 AM
nice shadow, makes it more interesting.
  Photographer found comment helpful.
 03/09/2009 12:32:18 AM
The shadow makes this one stand out
  Photographer found comment helpful.


Home - Challenges - Community - League - Photos - Cameras - Lenses - Learn - Help - Terms of Use - Privacy - Top ^
DPChallenge, and website content and design, Copyright © 2001-2025 Challenging Technologies, LLC.
All digital photo copyrights belong to the photographers and may not be used without permission.
Current Server Time: 10/30/2025 10:23:22 PM EDT.