Thank you for your replies.
Your arguments and remarks are all cogent and germane.
I see that it might have been helpful if I had expanded on my rationale.
Although this should be no barrier to self-change, I, like others, have got set in my ways. That is, I like to use books versus the internet.
I should say; I acknowledge not all parts of the Pocket Reference are equally useful, in addition; I lack the experience to utilize parts of the book.
One of the frustrations of the Internet for myself; I know some information about some subject exists. However, I don’t know how to find it due to a personal lack of knowledge, that is, I don’t know how that thing is called. I frequently hunt around under one search term and then find the information is best approached with a search term I hadn’t thought of.
My search for Charles Babbage below is a fair example; I wanted to check the spelling of his name, Charles Babbage by itself brings up a modern person, it wasn’t until I added “difference engine” that I got my desired result. Yes, this also demonstrates some of the limitations of the “one source” approach.
When I want a specific constant or conversion factor I know that I can find much of that information in the Pocket Reference, I carry one around most of the time.
That any reference book is inherently out of date has been well known long before the Internet. However the information I have the most interested in is conversion factors and constants, these have not changed significantly. Again, the Pocket Reference has a reasonably large collection of those.
Another factor that pertains to me; I’m a browser, howbeit human, that is; I scan through books and often find the information I want or as it does happen, information that I didn’t know I wanted. The Internet is not as well suited IMHO for this casual browsing.
Derleth, respectfully, I did not claim that conversions tables were more accurate, this is demonstrably not the case. You claim, apparently by inference, to have knowledge of my own internal cognition regarding conversion tables versus online calculators. Your statement is erroneous, I am well aware of the limitations of using tables etc.
As for the genesis of conversions etc. you undoubtedly are aware that many of these started as hand calculations. It was just for the reason of the inherent error in such tables that such folk as Charles Babbage designed and saw through the construction of his difference engine.
However, when one is setting up an equation or needs a constant for a spreadsheet it’s handy to have a constant or conversion factor readily available.
Sigh, I detect a bit of defensiveness in my writing, I don’t intend to offend.
Thank you for your replies, Respectfully, Zuer-coli