Posted by SD John on November 28, 2013 at 17:08:19 from (68.69.88.176):
In Reply to: O/T Bathroom Project posted by Roger - Kansas on November 28, 2013 at 15:19:20:
The white markings are "tangental rays" that occur in the wood. Cells that carry stuff horizontally across the tree.
Ray Category--Oak-type Rays (occurring exclusively in oaks, producing distinct light-colored radial lines on cross sections, very tall ray flecks, and dark longitudinal lines as tall as corresponding ray flecks, on tangential surfaces)
red oak group: on cross sections, distinctive light-colored radially-oriented lines running across typically ring-porous growth rings; forming fairly wide irregularly-shaped stripes'' of ray flecks on radial surfaces, approximately 1/4 inch along the grain; definite dark-colored lines approximately 1/4 inch along the grain on tangential surfaces.
white oak group: on cross sections, distinctive light-colored radially-oriented lines running across typically ring-porous growth rings, usually somewhat wider than in red oak; forming very wide irregularly-shaped stripes'' of ray flecks on radial surfaces approximately 1/2+ inch along the grain; definite dark-colored lines approximately 1/2+ inch along the grain on tangential surfaces.
live oak: on cross sections, rays appear as approximately 1/8 inch wide, light-colored, radially-oriented lines running across growth rings whose boundaries are indistinct; extremely wide, irregularly-shaped stripes'' of ray flecks on radial surfaces more than one inch along the grain; definite dark-colored lines more than one inch along the grain on tangential surfaces. Wood is extremely hard and heavy.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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