This section is from the book "The Gardener's Monthly And Horticulturist V22", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
Just now much space is given to this subject by our contemporaries, - and it may serve a useful purpose to give here a plan which was published by the writer of this many years ago. It is one of those cases where old things are as good as new, - for geometrical rules are good for all times.
A very easy, simple and correct mode of measuring the height of trees is as follows:
Measure any distance from the tree you choose, say 90 feet, and plant a perpendicular stake B F in the ground, of any height, say 5 feet; then at any distance, say 10 feet, from this stake, and on the opposite side of it from the tree, plant another perpendicular stake C E, which must be driven into the ground until the points E F G are brought into a range. Measure the heights of each of the stakes B F and C E, and find the difference in their lengths or heights. Then proceed as follows: Divide the distance from the trunk of the tree to the stake C E, say 100 feet, by the distance between the two stakes B F and C E, say 10feet; then, supposing the difference, in the length of the two stakes is 2 feet, multiply the product or dividend obtained as above by this difference, which will give 20 feet, and then supposing the height of the stake C E is 3 feet, add this to the 20 feet, which will make the height of the tree 23 feet.
In case the ground is not level, the spirit-level will assist you.
This mode of measuring trees is an adaptation of our own, of a very simple problem in trigonometry, to the purpose.