It should be a permanent trellis, made of cedar posts set three feet deep, so as to be below the frost line and four feet high.
Thus in a half hour we passed the frontier between the agricultural folk below the frost line and the shepherd folk above it.
The crevices where racers hibernate are known to be several feet deep in some instances, extending well below the frost line.
Then the pipe throughout its entire length must be in a trench below the frost line at the entrance to the spring as elsewhere.
This is done to get the invalid below the frost line as quickly as possible.
It should never be so high that it will come above the frost line which is two and a half feet in depth.
Earthworms live underground in burrows that are sunk well below the frost line.
The march of civilization has actually pushed back the frost line some distance.
Growers tell me that Snyder blackberries are killed down to the frost line, which proves it is not iron-clad, as some believe.
Gasoline is admitted through pipes below the frost line from two 50-gallon tanks underground, 30 feet from building.
|frost line |