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The Tao of Measurement: 
A Philosophical View of Flow and Sensors

A Featured Title at ISA Books

This website is devoted to discussion of the book by Dr. Jesse Yoder 
and Dick Morley that looks at the theory of sensors and measurement.

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Richard Morley of Mason, N.H., known as the ‘father’ of the programmable logic computer, and our own Jesse Yoder, President of Flow Research, put their heads together and came up with The Tao of Measurement, a reading experience that will be of interest to anyone working in the field of flow and measurement – or with a natural curiosity about the underlying principles thereof.

This book deals with the past, present, and future of flow, sensors, and measurement. It is called The Tao of Measurement because, like the Tao itself, it reveals the underlying principles of flow and measurement. It explains the engineering and physics of flow and sensors, how our units of measurement were derived, present day measurement practices, and how today’s scientific tools can improve our units of measurement. It’s a must-read for anyone involved in instrumentation or process control. 

The book’s opening chapters explore the technologies of temperature, pressure, and flow measurement. The book presents a thorough discussion of the different types of temperature sensors, pressure transmitters, and flowmeters. It contains an explanation of applications, and then comments on trends in sensors and measurement. Each chapter includes a handy glossary of units of measurement. The authors then turn their attention to three very familiar but vital subjects: time, length, and area. They trace the origins of today’s units of measurement for these variables, all the way back to Greek and Roman times, then follow their development to today’s atomic clocks and the standard meter, now defined in terms of wavelengths of light. 

Richard Morley

Jesse Yoder

Click here to read the Outline of the Book

This book describes how modern technology can be used to improve units of measurement. It paints a picture of a dynamic and changing universe, one in which systems can be integrated with improved measurement practices. It looks beyond the static nature of everyday objects to an underlying reality that is dynamic and changing. It describes the technologies that are available to effectively configure a cost-effective system, and then shows how to integrate this system with the most powerful sensors and tools of flow measurement. Systems and instrumentation, the yin and yang of the automation world, are finally united in a synthesis that comes from seeing both from a single perspective. The Tao of measurement is revealed, and, in the end, it is all about flow. 

The Tao of Measurement is a revolutionary look at our traditional concepts of flow, time, points, and circles. Our technology has evolved very rapidly, but it has done so using concepts older than Roman chariot wheels. It is time for a fresh look, and this book provides it. 

Each section of the book can be used as a standalone handbook or as a readable engineering manual. The book is available from ISA: https://www.isa.org/store/products/product-detail/?productId=35851274.

Also available at Amazon.

Questions? Comments? Feel free to contact Dr. Jesse Yoder at Jesse@flowresearch.com or Dick Morley at Morley@alum.mit.edu.


This book develops the theory of measurement of some of the most important and commonly measured variables.  The approach of the book is both historical and theoretical.  It looks at different measurement instruments and tools that have been developed for measuring common variables, and explains the theory behind them.  It then uses the theory developed to talk about current and future developments in measurement for the particular variable being discussed.

This book looks at the following variables, and the tools and instruments used to measure them:

  • Flow
  • Pressure
  • Temperature
  • Time
  • Length
  • Area

The sections on length and area will explore some alternative views of geometry, including circular geometry. You can find a discussion of some of these ideas at www.flowmath.com

The discussion of time will include some alternative views of time, including decimal time and flowtime. For more information on flowtime, go to http://www.flowresearch.com/Flowtime/flowtime.htm

For more information on Dick Morley, go to www.barn.org.

For more information on Jesse Yoder, go to www.flowresearch.com or www.jesseyoder.com

More on Measurement:



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