It's a homemade sleeve, an iteration on a design used pretty widely by tree climbers. It's a specific type of 1/2" ID liquid tight electrical conduit (not all liquid tight conduit works well for this application), smooth interlocked flat steel coil inside, vinyl on the outside. The inside bend radius is about 3". The end caps are also a particular type, they are screwed in and are further secured with vinyl tape. If you contact me directly I'll give you the specs etc. for the components. -AJ [email protected]
At 07:56 PM 3/15/2009, you wrote: >Hi Andrew, I was looking at your pictures on Flicker and wondered >about the friction-saver you were using; is it home made? Can you >tell me about it? >Thanks >Peter >On 15-Mar-09, at 8:35 PM, Andrew Joslin wrote: > > > > > I reported this cottonwood in the Charles River floodplain in West > > Roxbury, Massachusetts a year or so ago. I was never happy with the > > height measurement so I went back and tried to nail it down. The > > highest twigs are very difficult to isolate (aren't they all?) with a > > decent view of the trunk through surrounding red maples and thicket. > > From two different vantage points I was able to come up with > > consistent enough results, 110.34' and 110.45', naturally I'll take > > the high measurement. I had a third measurement that promised to be > > in the 112' + range but I couldn't get a clear shot to the base of > > the trunk to finish the bottom sine figure. > > > > Eastern Cottonwood > > CBH 13' 6" > > Height 110.45 > > > > Photos of the tree here: > > http://www.flickr.com/photos/naturejournal/sets/72157615035370313/ > > > > Andrew Joslin > > Jamaica Plain, MA > > > > > > > > > > > > --~--~---------~--~----~------------~-------~--~----~ Eastern Native Tree Society http://www.nativetreesociety.org Send email to [email protected] Visit this group at http://groups.google.com/group/entstrees?hl=en To unsubscribe send email to [email protected] -~----------~----~----~----~------~----~------~--~---
