engineering

John T. Polhemus

John T. Polhemus is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand John T. Polhemus rather than just read about it. In short: John Thomas Polhemus (September 11, 1929 – May 21, 2013) was an American entomologist, bio-engineer, and expert in remote sensing. Known for his research on aquatic Heteroptera (water bugs) and his contributions to NASA’s space program, Polhemus wrote 288 peer-reviewed publications and described 474 species new to science.

Key takeaways

John T. Polhemus belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect John T. Polhemus to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of John T. Polhemus from memory before moving on to harder problems.

Reference excerpt

John Thomas Polhemus (September 11, 1929 – May 21, 2013) was an American entomologist, bio-engineer, and expert in remote sensing. Known for his research on aquatic Heteroptera (water bugs) and his contributions to NASA’s space program, Polhemus wrote 288 peer-reviewed publications and described 474 species new to science.

Biography Early Life and Education John Polhemus was born in Ames, Iowa, as the youngest of three sons. His father, George Nelson Polhemus, was an engineer supervising operations at the Iowa Highway Commission, and his mother, Elsie Bonham Polhemus (Husted) was a former schoolteacher. John's curiosity for nature, particularly aquatic insects, was ignited during his childhood explorations of local streams. This led to an early mentorship with Dr. Carl Drake, a noted heteropterist at Iowa State University. After graduating from Ames High School in 1947, Polhemus attended Iowa State College but left to serve in the U.S. Air Force, where he trained in radar technology. This experience prompted him to later pursue a degree in electrical engineering, which he completed with honors in 1956. Engineering Career and NASA Contributions Polhemus began his engineering career at the California Research Corporation, where he worked on the development of the first mass spectrometer. In 1960, he joined Martin-Marietta (now Lockheed Martin), contributing to NASA's Apollo program. His work resulted in several key patents related to bio-sensing and remote sensing technologies, which advanced both space exploration and medical technology. Among Polhemus’s inventions are U.S. patents in biomedical sensing and instrumentation. These include the Pulse Transducer with Artifact Signal Attenuator (U.S. Patent 4,198,988), which addressed motion-induced artifacts in physiological measurements and was applied in aerospace heart-rate monitoring systems; the Condition Sensor System and Method (U.S. Patent 4,092,633), which improved motion and condition detection, including applications in assistive technologies for the visually impaired; and the Integrated Parameter Display of Galvanometer Reading (U.S. Patent 3,548,378), which enhanced real-time visualization of sensor data for scientific and aerospace instrumentation. In this period, Polhemus was head of the Display Systems Research Group at the Martin Marietta Corporation, where he conducted research on computer-compatible interactive display systems and related digital technologies. Entomological Research and Contributions Polhemus is best known for his work in entomology, particularly the study of aquatic Heteroptera. His scientific career was marked by extensive fieldwork, during which he collected specimens from over 67 countries across six continents. His collection is contains over half a million specimens representing 5,000 species. John T. Polhemus authored 288 peer-reviewed publications and described 474 species, 54 genera, and 5 tribes of aquatic Heteroptera. The publication lists his extensive field collection numbers, providing future researchers with resources to associate samples and localities. His holotype repositories, containing the species-level taxa, are housed at institutions worldwide. Polhemus’s taxonomic work earned him international recognition, and his collaborations with his son Dan furthered their shared legacy. He held numerous academic positions as a Research Associate at institutions such as the Smithsonian Institution, the American Museum of Natural History, and the University of Colorado. Legacy and Impact In 1985, Polhemus retired from Martin-Marietta to focus entirely on entomology. He pioneered the application of remote sensing data to biological challenges, particularly in pest control efforts for tsetse flies and screw worms. His comprehensive insect collection, now housed at the Smithsonian Institution, remains a critical resource for entomologists worldwide. His work was an integration of engineering and biological sciences. His son Dan has followed in his footsteps in the field of entomology.

References

Illustrations

Worked examples

Example 1 — a first encounter with John T. Polhemus

Start with the simplest possible case. Write down what John T. Polhemus claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to John T. Polhemus before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about John T. Polhemus ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of John T. Polhemus

In research: John T. Polhemus appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses John T. Polhemus in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: John T. Polhemus is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1929 births, 2013 deaths, 20th-century American scientists, so understanding it makes those chapters shorter.
In everyday life: Look for John T. Polhemus outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study John T. Polhemus in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what John T. Polhemus means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain John T. Polhemus out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is John T. Polhemus in simple terms?

Why does John T. Polhemus matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study John T. Polhemus?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on John T. Polhemus.