This section is from the book "Industrial Recipes", by John Phin. Also available from Amazon: The Workshop Companion.
Kemlo says the stalk of the common mullein affords the best pith for cleaning watch-pinions. It may be found in old fields and by-places all over the country. Winter, when the stalk is dry, is the best time to gather it. Elder-pith is good, and is easily obtained.
 
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