The logarithmic ruler is the main calculating device of the XX century


2022-07-02 14:19:22




1Like 0Dislike


logarithmic ruler

In the age of computer technology, most calculations in the design of equipment are fully automated, engineers can only enter the required parameters through a user-friendly interface.

The XX century was called differently. It was atomic, cosmic, and informational. Aircraft designers improved the planes, and they turned from clumsy biplanes into swift supersonic MiGs, "Mirages" and "Phantoms". Giant aircraft carriers and submarines began to surf the seas and oceans at all latitudes. An atomic bomb was tested in Los Alamos (New Mexico), and the first nuclear power plant began to give energy in Obninsk, near Moscow. Rockets soared skyward...

How were the atomic bomb, rockets and jet planes calculated?

Historical chronicles demonstrate the process of working on these achievements. Scientists and engineers in white coats, standing at the coulmans and sitting at tables littered with drawings, make the most complex technical and scientific calculations on arithmometers. Sometimes in the hands of Tupolev, Kurchatov or Teller suddenly turned out to be a thing unfamiliar to a modern young man - a slide rule. Photos of those whose youth passed in the post-war decades, up to the 80s, also recorded this simple subject, which successfully replaced them with a calculator while studying at the institute or graduate school. Yes, and dissertations were also considered on her, on her own.

slide rule photo

What is the principle of the logarithmic ruler?

The main principle of operation of this wooden object, neatly pasted with celluloid white scales, is based on logarithmic calculus, as the name implies. More precisely, on the decimal logarithm. After all, everyone who has studied higher mathematics knows that their sum is equal to the logarithm of the product, and, therefore, by correctly dividing into movable parts, it is possible to achieve that multiplication (and hence division), squaring (and root extraction) will become a simple matter.


Launching the aquarium. Step-by-step instructions and process features

Launching the aquarium. Step-by-step instructions and process features

Everyone who has decided to acquire such a miracle of the underwater world as an aquarium is experiencing many difficulties. That's because many people have no idea what it takes to make a beautiful large aquarium pleasing to the eye, and not just a ...

Equipment for ATVs. What does the uniform of the pilot of this car include?

Equipment for ATVs. What does the uniform of the pilot of this car include?

Today, almost every city park has playgrounds equipped for quad bike racing. Every vacationer can try himself in this sport. But it is important to know that before you get behind the wheel of this transport, you need to wear special uniforms. Race o...

Floor lamps with a table – a forgotten element of the interior

Floor lamps with a table – a forgotten element of the interior

Quite often, seemingly long-forgotten objects return to the interior of our apartments and look modern and organic in them. This can be said about floor lamps. Perhaps someone else remembers how warm and cozy it was in Grandma's room, which was illum...

The logarithmic ruler became popular back in the XIX century, when the main means for carrying out calculations were ordinary abacus. This invention was a real find for scientists and engineers of that time. It took them a while to figure out how to use this device. In order to learn all the tricks and reveal its full capabilities, fans of the new counting mechanism had to read special manuals, quite voluminous. But it was worth it.

logarithmic circular ruler

The rulers are different, even round

Nevertheless, the main advantage that the logarithmic ruler has is its simplicity, and therefore reliability. Compared to other methods of calculations (there were no calculators yet), operations were performed much faster. But there are also moments that should not be forgotten. Calculations can be made only with mantissas, that is, an integer (up to nine) and a fractional part of a number, with an accuracy of two (three, who have very good eyesight) decimal places. The order of the numbers had to be kept in mind. There was another drawback. The ruler is logarithmic, although small, but it is difficult to call it a pocket device - 30 centimeters after all.

However, the size did not become an obstacle for inquisitive minds. For those who, by their occupation, should always have a counting device with them, a compact logarithmic ruler was invented. A circular dial with hands gave it a resemblance to a watch, and some models of expensive chronometers contained it on their dial. Of course, the capabilities of this device and its accuracy were somewhat inferior to the corresponding parameters of the classic line, but it could always be carried in your pocket. And it looked more aesthetically pleasing!

Article in other languages:

Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

Comments (0)

This article has no comment, be the first!

Add comment

Related News

Appraiser's Day - what kind of holiday is it?

Appraiser's Day - what kind of holiday is it?

Relatively recently, the Appraiser's Day has joined the string of Russian professional holidays.HistoryOn November 27, 1996, the Ministry of Labor and Social Development of the Russian Federation by its decree approved the positio...

Curtains and lambrequins in the hall

Curtains and lambrequins in the hall

The hall is the hallmark of the apartment, as guests are received there and special events are celebrated. Therefore, every detail of the furniture of this room is so important for the perception of the overall picture. Properly s...

The drug Pantocalcin: description and application

The drug Pantocalcin: description and application

The drug "Pantocalcin" is a nootropic agent, the activity of which is associated with the presence of gamma-aminobutyric acid in the composition. The drug has neuroprotective, neurometabolic, neurotrophic effects, increases brain ...

JOG DOG - children's shoes that combine excellent quality and reasonable price

JOG DOG - children's shoes that combine excellent quality and reasonable price

The choice of winter shoes should be approached very seriously. This is especially true for shoes for children. The health and mood of a little person depends on how high-quality and reliable the model will be. JOG DOG – children'...


Medicine "Lazolvan" (baby syrup): instructions for use

An excellent expectorant that effectively dilutes sputum is the drug "Lazolvan". The instructions for use describe baby syrup as a drug with a fruity aroma. In addition to this form, tablets, a solution for inhalation and intraven...

Gasman's Day - what kind of holiday?

Gasman's Day - what kind of holiday?

Gas Worker's Day is almost the most celebrated holiday in Russia. Perhaps only the celebrations of builders and metallurgists can compare with it. Almost 30% of our country's economy is tied to this product.Important to knowOn the...