engineering

Marvin Camras

Marvin Camras 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 Marvin Camras rather than just read about it. In short: Marvin Camras (January 1, 1916 – June 23, 1995) was an electrical engineer and inventor who was widely influential in the field of magnetic recording. Camras built his first recording device, a wire recorder, in the 1930s for a cousin who was an aspiring opera singer named Willy.

Key takeaways

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

Reference excerpt

Marvin Camras (January 1, 1916 – June 23, 1995) was an electrical engineer and inventor who was widely influential in the field of magnetic recording. Camras built his first recording device, a wire recorder, in the 1930s for a cousin who was an aspiring opera singer named Willy. He also built Willy a telephone, because he could not afford one, at the age of 8. Shortly afterwards he discovered that using magnetic tape made the process of splicing and storing recordings easier. Camras's work attracted the notice of his professors at what became Illinois Institute of Technology (IIT) and was offered a position at Armour Research Foundation (which merged with Lewis Institute in 1940 to become IIT) to develop his work. Before and during World War II Camras' wire recorders were used by the armed forces to train pilots. They were also used for disinformation purposes: battle sounds were recorded and amplified and the recordings placed where the D-Day invasion was not going to take place. This work was kept secret until after the war. In June 1944 he was awarded U.S. patent 2,351,004, titled "Method and Means of Magnetic Recording". In all, Camras received more than 500 patents, largely in the field of electronic communications. Camras received a bachelor's degree in 1940 and a master's degree in 1942, both in electrical engineering, from IIT. In 1968, the institution awarded him an honorary doctorate. In May 1962 Camras wrote a speculative prediction paper titled "Magnetic recording and reproduction - 2012 A.D.". In his paper Camras predicted the existence of mass-produced portable media players he described as memory packs the size of a package of playing cards holding up to 1020 bits of information. Such devices would not have any mechanical moving parts and would store both sound and movies. He also predicted music and movie downloads, online shopping, access to online encyclopedias and newspapers and the widespread use of online banking transactions. Camras built his own house by hand, doing everything except laying the foundation. He also built a bomb shelter in this house. In recognition of his achievements, he received the National Medal of Technology award in 1990. Marvin Camras died of kidney failure at the age of 79 in Evanston, Illinois.

Worked examples

Example 1 — a first encounter with Marvin Camras

Start with the simplest possible case. Write down what Marvin Camras 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 Marvin Camras 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 Marvin Camras 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 Marvin Camras

In research: Marvin Camras 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 Marvin Camras 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: Marvin Camras is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1916 births, 1995 deaths, 20th-century American Jews, so understanding it makes those chapters shorter.
In everyday life: Look for Marvin Camras 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 Marvin Camras in 20 minutes

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

Frequently asked questions

What is Marvin Camras in simple terms?

Why does Marvin Camras 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 Marvin Camras?

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 Marvin Camras.