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The slide rule built into a watch is a kind of analog calculator. It allows you to perform a variety of mathematical calculations, from simple multiplication and division to more complex operations like finding the square root.
| Component | Description |
| Outer Scale | Located on the rotating bezel (rim) of the watch. Usually white in color. |
| Inner Scale | Located on the watch dial; it is stationary. |
| Bezel | The rotating rim around the dial that allows you to align values on the outer and inner scales. |
The slide rule built into a watch is a kind of analog calculator. It allows you to perform a variety of mathematical calculations, from simple multiplication and division to more complex operations like finding the square root.
This tool consists of two main scales that interact with each other when the bezel is rotated. Understanding how they work is the key to using its full functionality.
All calculations are performed by aligning specific values on these two scales. Using the Breitling Navitimer watch as an example, we can see how this works in practice.
The simplest operation you can perform with a slide rule is multiplication. The process is intuitive and requires only a few steps.
Let's consider the example of multiplying 14 by 15. To do this, you need to follow these steps:
Thus, 14 multiplied by 15 equals 210. This method allows you to quickly get results without using electronic devices.
Division is performed using the reverse principle of multiplication. It is also a simple operation that is easy to master.
For example, let's divide 240 by 12. The sequence of actions is as follows:
In this case, the number '20' will be opposite the '10' mark. Therefore, 240 divided by 12 is 20.
With a slide rule, you can also square numbers. This process is very similar to multiplying a number by itself.
Suppose you need to calculate 15 squared. The steps are as follows:
Thus, 15 squared is 225. This method allows for quick calculations for any two-digit numbers.
Finding the square root is a more complex operation that requires attention to detail. Here, you need to find a number that, when aligned on the two scales, gives the desired result.
Let's take the example of finding the square root of 196. The task is to find a number that is simultaneously on the inner scale opposite 196 (marked as 19.6) on the outer scale, and on the outer scale opposite the '10' mark on the inner scale.
The process comes down to trial and error: by rotating the bezel, you need to find the position where the values align. In this case, by rotating the bezel, you can find that the number 14 is the solution: it is on the inner scale opposite 196 on the outer scale, and simultaneously, 14 on the outer scale is opposite the '10' mark on the inner scale. Thus, the square root of 196 is 14.
The slide rule can be used for practical tasks, such as calculating hourly fuel consumption. This is especially useful in aviation.
Suppose 150 liters of fuel were consumed in 25 minutes. To find the hourly consumption, you need to do the following:
Another practical example is calculating the distance traveled based on speed and time. This can be useful for pilots or drivers.
Suppose a helicopter is flying at a speed of 240 km/h. What distance will it cover in 46 minutes?
This function allows you to quickly perform navigation calculations with only a watch on hand, even if other instruments have failed.
