What's your diameter breast height?

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20 Responses to “What's your diameter breast height?”

  1. Paul Renault says:

    Er… “adult breast height” also varies greatly from 18 to 80, no?

  2. snagglepuss says:

    Metal bands have been known to measure more than one babes, er, “diameter” as well.

  3. t3kna2007 says:

    > If you measured one tree at the wide base and the other further up the trunk, where trees usually get narrower, the comparison wouldn’t mean much.

    See also Adenium obesum, the Desert Rose tree of Socotra island, featured in a recent National Geographic  issue.

    http://www.birdsofkuwait.com/blog/wp-content/2008/12/desert_rose.jpg

  4. jeb says:

    This reminds me of the time I needed a table of a certain height.  It had to be taller than the usual coffee table(18-21″), but shorter than a table of normal height (31″).

    I was looking for a ball-height table.  I walked through a number of antique and second-hand stores surreptitiously standing way too close and personal to likely candidates.

    • Beanolini says:

      “I surmise, Watson, that this print was left by a man of lower than average height… or one with a very saggy scrotum”.

      The standardised DBH reminded me of the standardised ‘present time‘ in archaeology. As this was 1950, we are currently 62 years in the future, and accelerating gradually away.

    • Jim Saul says:

      Careful about that height. I recently regretted that a table in my workroom is just that height when a drill bit got caught in a pine knot, making the wood whipspin around to give me a resounding sack-smack before I could react.

    • pjcamp says:

       I think I know what *you* were up to.

  5. Wishbones says:

    Variable radius sampling by means of a glass prism is an interesting part of the timber cruiser’s job, I’ll let wikipedia explain: 
    http://en.wikipedia.org/wiki/Wedge_prism

  6. Mark Johnstone says:

    As a trainee rural chartered surveyor, I was taught how to value a standing forest. We had special tape measures that were marked with DBH units rather than the circumference – i.e. they had already divided the circumference measurement by pi so that you could shout out the number to your colleague to record it. 

    We also measured top heights with a hooked tape measure attached to a belt – hooking the tip into the bark of a tree we would stride away from it for, say, 50m and then use a clinometer aimed at the top of the tree to give a Tan multiple to be applied to the horizontal distance to calculate the top height. 

    By measuring the DBH of every 10th tree or so and using a simple average, together with the average top height for every 30trees or so and the planting density, you could use species dependant tables to calculate the volume of standing timber in the forest. You also got to spend a summer’s day walking though the shady woods which was very nice indeed.

  7. leaded says:

    i recently learned about dbh the hard way.  the maple tree in our front yard in toronto has a dbh such that we had to give the city a $15000 deposit so we could renovate our front porch. 

  8. SedanChair says:

    I’m here because somebody said “breast”

  9. chgoliz says:

    1.4 meters = 4.6 feet (a little over 55″).

    Average height for a woman: 5’6″ (66″).

    I am 5’6″.  1.4 meters hits me at my throat.

    In other words, the standard is set to be breast height on an adult man, not an “adult”.

    • Antinous / Moderator says:

      Actually, a 6′-2″ adult, which is considerably taller than the average man.

      • chgoliz says:

        I see….so we’re look for a Dutch man as our standard.  (I think the Germans are right behind them in terms of height.)

  10. foobar says:

    There’s a simpler solution that marking all the trees: buy a plain t-shirt, and mark on it where your breasts should be.

  11. pjcamp says:

    Joke parade:

    1. Adult trees got boobs?

    2. I think all adults should go with metal bands around their breasts.

    3. Seems like a 1.4 m tall stick would be in order. With a tape nailed to the end.

    4. Or a 6’2″ naked woman .. um .. research assistant.

    5. When you band a tree, do you catch them again on the next migration?

    I’m here all night, folks.

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