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Related to barndoor: barndoor skate
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an opaque adjustable flap on a lamp fixture

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Possession and landing of thorny, smooth, and barndoor skates have been prohibited since 2003 due to their low levels of relative abundance (NEFMC, 2003).
SlmonJE, Cook A, Rowe S, Simpson M (2009) Pre-COSEWIC review of barndoor skate Dipturus laeiis in the Canadian Adantic.
For example, the barndoor skate has declined 90 to 99% over the last 50 years due to incidental capture in trawls and dredges (Casey and Myers 1998).
In the truest tradition of locking the barndoor after the cow has wandered out, solutions were appearing just as the end was near.
And, of course, Alan Smith, a barndoor leader who loves being combative, has seen his international chances greatly enhanced by a summer transfer to Manchester United.
Chapter 8 gives lessons on how to capture star trails as well as how to make the barndoor star tracker, an equatorial camera platform known in the United Kingdom as the Haig or Scotch mount, after Scottish astronomer George Haig, who designed it in the mid-1970s.
Among the unintended victims of trawling have been skates, especially the spectacularly large barndoor skate, Raja laevis, in the Atlantic off North America.
They hang from a barndoor track mounted to a beam above the opening.
2) In a season when top strikers like Torres and Defoe can't hit a barndoor, revel in their misery.
One especially novel project involves astrophotography with barndoor tracking mounts and reused disposable cameras.
Haig introduce his barndoor mount, enabling a small camera to track the sky's motion for 20 minutes or so.
The astrophotography section is a mix of basic camera trackers (a tangent-compensated barndoor mounting by Tonkin and a simple wooden "skypod" tracker by Euan Mason) and Al Kelly's description of building the Cookbook camera.
Barndoor camera mounts have recently enjoyed a popularity spurt, thanks to the spectacular apparitions of comets Hyakutake and Hale-Bopp.
Photographs and easy-to-follow instructions guide the reader through building an inexpensive barndoor tracker.
Contract awarded for Barndoor teachers seconds Laboratory Improvement Corporation