Rich_WI said: (quoted from post at 22:42:02 04/12/10) Biltmore sticks are accurate to a couple feet, if JDemaris needs to be more accurate than that, he should by all means get somebody to help him with that.
Besides, the next best information given to JDemaris was either $2000 equipment that he dont own or people saying to measure shadows with no formulas given or explained. A Biltmore stick is common and fairly easy to get. You can even make your own using charts available on the internet for custom distances, say your arm is longer and you want to hold the stick 25 inches from your eye, they have a chart for that. Want to stand 100 feet from the tree, I seen that chart too.
Using the charts on the internet, I made my own stick for my own eye distance and since I didnt need it for measuring board feet of lumber, I only wanted it for tree height, I just used the chart for my measurements. My stick just shows height in 2 foot incriments, since my eye easily can cut those incriments in half, I consider it accurate to 1 foot. If I ever need to calibrate it, I could take it to work and measure some multi story buildings that were shot with a lazer and I could compair to that. I really dont that will be needed though as I dont think I will need it to be THAT accurate.
I did provide a link to the simple formulas. A Biltmore (hypsometer) is based on the principle of ratios exactly as is the shadow measurement, but the shadow measurement is more exact in 2 ways. 1) it relies on measurement with a tape measure, not an eyeball 'it is about there' while trying to focus on both near & far objects, and 2) in the shadow measurement technique, there is NO arc length vs chord error, which is built into the Biltmore (hypsometer) stick technique (small, it may be).
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
... [Read Article]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
