31-05-2005, 02:13 PM
|
|
|
wrote:
James Black wrote:
Where can I find mitre angles for creating a circular border around
the base of trees? For example, what is the angle cut needed to
create a 7 foot circle, an 8 foot, or 9 foot circle?
Thanks.
This isn't what you're asking, but aren't railroad ties treated with
all sorts of nasty wood-preserving chemicals, chemicals that can leach
into the ground water?
Patrick
True, but the rate of leaching is slow, especially if the ties are
treated with creosote. (The danger of creosote has been exaggerated
IMO.) Your state may also have amended regulations so that arsenic is no
longer permitted in pressure treating wood. If no, you may wuish to
avoid such wood, but again, the amount of arsenic leached into the
ground is minimal, especially compared to nastier things dumped outside
by nearby industries, gas stations, etc (and leachates can travel long
distances, so "nearby" may mean tens of miles away.) The remaining
chemicals are mainly copper sulfate and fungicides, neither of which are
cause for alarm (unless you get down on your hands and knees and gnaw on
the wood... :-o).
Besides, there are worse sources of pollution in your neighbourhood,
such as the car in your driveway or the power mower you use.
As for mitre angles -- they don't depend on the diameter of the cirle,
but on the number of pieces you use to make the circle. Divide 360 by
twice number. This will be the mitre angle in degrees on each end of the
tie.
Have fun!
|