[ATM] Sonotube info

[Mark Holm <mdholm@telerama.com>]

FYI,

Sonotube is a trademark of the Sonoco Corporation.  They are certainly
not the only company making cardboard tubes that can be coopted for
telescope use, but their brand name is most commonly used when referring
to tubes for telescope use.  It is quite possible that tubes from other
companies, designed for other purposes, are better for telescope use.

Sonoco makes at least three products that might be suitable for
conversion to scope use.

Sonotube® Builder's Tubes®  Intended for DIY use.  Probably the ones
available at retail.
http://www.sonoco.com/topnav/products+and+services/engineered+carriers+and+paper/tubes+and+cores/industrial+-+builder's+tubes.htm

Sonotube® Round Forms  Commercial concrete form tubes
http://www.sonoco.com/topnav/products+and+services/engineered+carriers+and+paper/tubes+and+cores/industrial+-+sonotube.htm

Round forms are available in a large range of sizes.
http://www.sonoco.com/resources/600_sonotube_round_sizes.jpg

Sonotube® Finish Free® Concrete Form   Strippable commercial concrete
form tubes designed to leave a nice finish on the cured concrete.  I
suspect these have a smoother inside construction than the others, e.g.
no spiral seam line.

http://www.sonoco.com/topnav/products+and+services/engineered+carriers+and+paper/tubes+and+cores/ipd+finish+free+fibre+form.htm

Finish Free® sizes go from 12 to 36 inch I.D., up to 12 feet long.
http://www.sonoco.com/resources/545_finish_free_sizes.jpg

-- 
Mark Holm
mdholm@telerama.com

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