chemistry

Holger F. Struer

Holger F. Struer is a chemistry 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 Holger F. Struer rather than just read about it. In short: Holger F. Struer (22 March 1846 – 17 June 1931) was a Danish chemist and founder of "H.

Key takeaways

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

Reference excerpt

Holger F. Struer (22 March 1846 – 17 June 1931) was a Danish chemist and founder of "H. Struers Chemiske Laboratorium" (In Danish: "Struers Kemiske Laboratorium") in 1875 at Skindergade 38, the centre of Copenhagen. Struers introduced in 1943 Micropol, a new principle for electrolytic polishing which made the preparation process within metallography more controlled in order to achieve better preparation results.

Career

The development of metallography was a continuous struggle to find better and easier methods to prepare metal surfaces for microstructure observation. Struers based his new principle for electrolytic polishing on Count Alois von Beckh Widmanstätten and his early experiments from the beginning of the 19th century that revealed the structure of iron from a meteor which had come down earlier in the century. He noticed that the structure could better be seen on plane, fine polished surfaces. By pouring nitric acid over the surface and letting it react for some time, he actually made a deep etch which developed the macrostructure. Pieces etched this way were used for printing the structure directly on paper. These "nature prints" turned "metallography" into lithography. All these experiments did not lead to any evaluation of the microstructure, but were limited to the macrostructure.

However, in 1863 Henry Clifton Sorby described in detail how he ground and polished samples in order to examine them under the microscope. He was able to magnify the structure up to 650x. From these observations he drew conclusions regarding the structure of pearlite and ferrite, and he was also able to watch the recrystallization of steel during cold working. For recording the microstructures he used three different methods available at the time: drawings, "nature printing" and microphotography. Considering that his research in the area of metallography only lasted two years, he discovered and established a wealth of information, and Sorby is considered to be the founder of metallography. Holger F. Struer saw the need for a laboratory making chemical analysis in the strongly developing "modern society", and in 1895 Struer began importing chemicals and instruments for the Danish market. In 1919 Struer obtained the Danish representation of the Austrian company, Reichert, a specialist in metallographic microscopes. The combination of chemical knowledge and the sale of metallographic microscopes changed the focus of Struer's company to metallography and metallographic analysis. In 1943 H. Struers Chemiske Laboratorium launched Micropol, and a new principle for electrolytic polishing was established. The introduction of Micropol was a technological progress since in this way the materialographic preparation process became more controlled in order to achieve an optimal preparation result in the shortest possible time. Today metallography is a part of materials science in its own right and extends to all fields of application, including ceramics, composites, electronic components and other solid materials.

Legacy H. Struers Chemiske Laboratorium is still active within metallography but is today just called "Struers Aps".

Bibliography "The Construction of Laboratory Apparatus for Schools", Unesco, added author Struers Chemiske Laboratorium, Paris, 1954 Struers, H. (1955), "The Construction of Laboratory Apparatus for Schools", Science Education, 41 (3): 247, doi:10.1002/sce.3730410373. "Metallographic and Materialographic Specimen Preparation, Light Microscopy, Image Analysis and Hardness Testing", Kay Geels in collaboration with Struers, ASTM International 2006 engineers.ihs.com

References

Further reading Online history of Struers company Struers today Industry insider Struers. Advanced Materials & Processes (August 2001)

Illustrations

Worked examples

Example 1 — a first encounter with Holger F. Struer

Start with the simplest possible case. Write down what Holger F. Struer claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, 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 Holger F. Struer 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 Holger F. Struer 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 Holger F. Struer

In research: Holger F. Struer appears in chemistry 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 Holger F. Struer 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: Holger F. Struer is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1846 births, 1931 deaths, 19th-century Danish businesspeople, so understanding it makes those chapters shorter.
In everyday life: Look for Holger F. Struer 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 Holger F. Struer in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Holger F. Struer 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 Holger F. Struer out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Holger F. Struer in simple terms?

Holger F. Struer (22 March 1846 – 17 June 1931) was a Danish chemist and founder of "H.

Why does Holger F. Struer matter?

Because it connects several chemistry 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 Holger F. Struer?

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 Holger F. Struer.