Specialty slide rule at the antique store

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SUMMARY

The discussion centers on the utility and historical significance of specialty slide rules, particularly in fluid flow calculations. A participant shares their experience of acquiring a slide rule from an antique store near Nashville, TN, which includes guide cards for various valve types. The conversation highlights the effectiveness of slide rules, such as the Dwyer velocity pressure slide rule, in providing quick comparisons and minimizing errors in calculations. Participants also note the rarity of certain models, like the Masoneilan version, and the importance of having physical tools in challenging environments.

PREREQUISITES
  • Understanding of fluid flow calculations
  • Familiarity with control valves, specifically Masoneilan control valves
  • Knowledge of slide rule functionality and applications
  • Experience with Dwyer velocity pressure slide rules
NEXT STEPS
  • Research the historical development of slide rules in engineering
  • Explore the use of nomograms in fluid dynamics
  • Learn how to effectively use Dwyer velocity pressure slide rules
  • Investigate the availability and applications of Masoneilan control valves
USEFUL FOR

Engineers, fluid dynamics specialists, and anyone interested in the practical applications of mechanical calculation tools in industrial settings.

ChemAir
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It still has the guide cards for how to read it for different types of valves, etc... I found it in a small town store, outside Nashville, TN, USA, picked it up because I haven't seen one of these before. A little tedious to use, but, it is more capable than I would've thought. Thought someone other than me might think it was neat.
 
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Slide rules are useful for quickly and easily comparing different alternatives. And they are a negligible source of error in fluid flow calculations.
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This one was given to me back when I was buying a lot of Masoneilan control valves.
 
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jrmichler said:
Slide rules are useful for quickly and easily comparing different alternatives. And they are a negligible source of error in fluid flow calculations.

I haven't seen the Masoneilan version of that one. Most of the interesting rules I've seen or had, found new homes very quickly, usually being lent out by those I lent them to. Somewhere there's a large repository of steam tables, relief valve calculators, nomograms, product data sheets...

I use the Dwyer velocity pressure slide rule all the time. I guess I could have done a spreadsheet for that, but it never really seemed necessary. Also, carrying a computer into some of the hellholes I go into check airflows would be problematic.
 
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