and the incentive for the author and publisher of said "free book" to invest in a "free book" enterprise is?
If you will consider paying for a book on the fundamentals of instrumentation, ISA.org has a number of books and older, or used instrumentation books are available from used book stores or web used book stores.
Walt, you stingy churl! I'm sure the original poster just shows up at HIS job out of the goodness of his heart, never expecting to get paid MONEY!
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Steve Myres, PE
Automation Solutions
(480) 813-1145