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From a Dietzgen Surveying and Equipment catalog. No date, but guessing 1960's?
Posted : October 24, 2012 5:49 am
What's with the spring and the left-hand thread?
Posted : October 24, 2012 6:04 am
Topic starter
The text on the opposite pages reads:
"The exclusive 'Spring-Loaded' locking device on the sectional Site-Rite range poles provides quick, easy positive locking action. Because of the unique manner of threading the joint, all threads are completely protected from damage in field handling and transportation. Sectional pieces can be carried in the back of a car or trunk without fear of damaging the joint. Made of strong, non-corrosive brass, with a tempered steel spring, the locking device is rugged, long lasting and will years of trouble free service."
Posted : October 24, 2012 6:51 am
