Measurement Roulette: History and Modernity

Practically in any house there is this measuring device. The usual mechanical measuring tape. It looks so simple that guessing about which one is the best does not come to mind.

The roulete meter was invented in the sixteenth century by a Chinese scientist Cheng Dway, used to measure land allotments. Actually, this meter became the "forefather" of the measuring roulette. Today this appliance is used not only by repairing masters. For help to this tool resorted even when they are going to buy new furniture, curtains. And even more so without it, you can not do with the construction of a garage, cottage, cottage, etc.

What kind of device is measuring roulette? The question that causes a smile. But still.

It is a tool for measuring large linear objects and for marking works in rooms. The main element of the roulette is an elastic band. The main material from which these tapes are made is steel calibrated in a metric or any other measuring system.

Measuring metal measuring tapes are a coil placed in a body on which a steel band is wound. For its reeling, a spring mechanism is provided. On sale you can find roulettes with two types of winding mechanisms:

• With a spring of recurrent action;
• With a mechanically rotating handle that is directly connected to the tape coil.

Measuring roulette of the second type is encountered more and more rarely. It can be safely enrolled into a "dying" species. The first are convenient because the masters working with them do not waste time on twisting them.

Could the Chinese inventor Cheng Dwei suggest that for fourteen years after his "grandiose" invention, the main element of the measuring tape would not be a metal tape, but a ray? In the current measuring instruments, it is the laser beam that is the "tape" that makes it possible to measure the distances between points with high accuracy. In addition, such a distance can reach several hundred meters. Of course, tape roulettes are not able to perform such a "feat."

What is a laser measuring tape? It is a compact device that easily fits in your pocket. He has a processor that reads information, and a display. The information is stored in the device memory. At the first necessity, a specialist working with laser tape measure can "resurrect" in memory the measurements obtained earlier. Working with such a tool is one pleasure, because Measurements are made in seconds. The master puts the roulette in one point, fixes the beam at another point and immediately on the monitor reads the necessary information.

This process of calculation looks like this:

1. The device sends pulses to the desired point;
2. The sent out impulses beat off this point;
3. Impulses are processed by the processor;
4. The information received through the processor is transmitted to the device screen.

Laser roulette, despite its accuracy and compactness, remains a rather expensive pleasure, so the bulk of the masters in the bag still have a measuring tape. GOST in such roulettes also exists, it just regulates everything that allows the master to produce high-quality measurements.