science

Sakizō Yai

Sakizō Yai is a science 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 Sakizō Yai rather than just read about it. In short: Sakizō Yai (屋井先蔵, January 13, 1864 - June 1, 1927) was a Japanese businessman and the inventor of a type of dry cell battery. Life Sakizō Yai was born on January 13, 1864, at the house of Yai, to a samurai family in the Nagaoka Domain (currently Nagaoka, Niigata Prefecture).

Key takeaways

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

Reference excerpt

Sakizō Yai (屋井先蔵, January 13, 1864 - June 1, 1927) was a Japanese businessman and the inventor of a type of dry cell battery.

Life Sakizō Yai was born on January 13, 1864, at the house of Yai, to a samurai family in the Nagaoka Domain (currently Nagaoka, Niigata Prefecture). The Yai family was an upper-class samurai family which held a property of more than 300 koku for generations, but at the age of six Sakizō's father died and the house went bankrupt. After this, his mother and his uncle took him over. In 1885, at the age of 21, Yai invented a continuous electric clock powered by wet-cell batteries. Electrically-powered clocks already existed, but they had conventional spring-powered clockwork movements, with electricity used to wind up the spring, while Yai's was a breakthrough, powered directly by a battery he had made. This continuous electric clock was recognized as the first electric patent in Japan in 1891. In 1887, Yai was successful in inventing a dry cell electric battery. However, he could not apply for a patent immediately because he could not pay the application fee for the patent, and the patent for the first dry battery in Japan was obtained by the electrician Ichisaburo Takahashi. Carl Gassner patented the dry cell battery in Germany and Helensen patented the dry cell battery in Denmark in 1888. In 1893, the Tokyo Imperial University's seismograph was exhibited at the 1893 World's Columbian Exposition, and the stored-charge batteries used in it surprised the visitors. In 1927, he suffered from gastric cancer, and died suddenly of acute pneumonia on June 1 of that year. He was 63 years old.

References

Illustrations

Worked examples

Example 1 — a first encounter with Sakizō Yai

Start with the simplest possible case. Write down what Sakizō Yai claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Sakizō Yai 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 Sakizō Yai 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 Sakizō Yai

In research: Sakizō Yai appears in science 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 Sakizō Yai 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: Sakizō Yai is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1864 births, 1927 deaths, 19th-century inventors, so understanding it makes those chapters shorter.
In everyday life: Look for Sakizō Yai 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 Sakizō Yai in 20 minutes

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

Frequently asked questions

What is Sakizō Yai in simple terms?

Sakizō Yai (屋井先蔵, January 13, 1864 - June 1, 1927) was a Japanese businessman and the inventor of a type of dry cell battery. Life Sakizō Yai was born on January 13, 1864, at the house of Yai, to a samurai family in the Nagaoka Domain (currently Nagaoka, Niigata Prefecture).

Why does Sakizō Yai matter?

Because it connects several science 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 Sakizō Yai?

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 Sakizō Yai.