Throughout life, a person is faced with a huge number of objects. Many of them become habitual in everyday use. But everyday things have nuances that few people know about. So, even a small hole in the cap from the handle or in the window glass of an aircraft performs an important function.
1. Handle cap
Each ballpoint pen has a cap. It is designed not only to prevent ink from drying or to protect things and objects from leakage. Each cap has a small hole or slots on the sides. They serve an important function.
Gnawing on a pen is one of the oldest childhood habits. If suddenly the child swallows the cap, and he gets stuck in the airways, then the hole will not let him suffocate. Air will pass freely through it until doctors can help a little patient.
2. Airplane porthole
Aircraft are designed to travel at high altitudes. Their design features allow them to withstand the difference between atmospheric pressure outside and inside the aircraft. A particularly sharp difference between them happens during takeoff and landing.
Portholes are also stressed by pressure differences. Each of them consists of three transparent panels. The outer one is quite thick and sturdy. The inner one is thin. Its main function is heat and sound insulation. A small hole is located in the middle panel, which serves not only as a "safety net" in case of deformation of the external "drain". Through a small hole, the pressure on the panel is balanced. In addition, they prevent fogging or icing.
3. Headphone plug and strange "barrel" on the power cord
There are strange stripes on the headphone plug, each with a different meaning. Their number may vary. From a technical point of view, each of the strips, as it were, separates the channels that conduct individual electrical impulses. If translated into "everyday" language, then the dashes on the plug indicate in which mode the headphones work. If there is only one strip, then in mono - "mono" mode. If there are two stripes - in stereo or "stereo" mode. Three stripes indicate that the headphones also function with a microphone.
There are strange cylindrical "barrels" on the power cords of many modern devices. This is what ferrite filters look like. They are needed in order to improve the signal quality. High-frequency interference - "parasitic" currents can occur inside the cable. Ferrite beads capture them exactly, extinguishing interference.
As an example, the hum or crackling of speakers, which periodically occurs if there is a mobile phone nearby. A cylindrical “barrel” on the power cord prevents such interference.
4. Deepening in the bottoms of the bottles
There are strange indentations on the bottoms of wine or champagne bottles. They were made for a reason. Punt is the name of a characteristic depression, intended for the safe transportation of wine over long distances. The bottles were placed in special boxes so that the neck of one was fixed with a recess on the other. This packaging method allowed to reduce the number of broken containers due to shaking on uneven roads.
In addition, during the storage of wine, a characteristic sediment is formed - "tartar". After being removed from the cellar, the drink was allowed time to settle. The suspension settled into the ring-shaped recess. The peculiarities of the shape of the depression in the bottom of the bottle retained the sediment. When pouring wine into the glass, if it did get, then only a small part of the suspension.
In champagne bottles, the recess reduces the pressure on the bottom. It is evenly distributed over its entire area, preventing the container from breaking. The notch is also used during the serving of the sparkling beverage. A thumb is placed in the punt, holding the bottle from below with the rest. This technique allows it to be better fixed in the hand.
5. Strange tail on roulette
All building tape measures have a strange contraption. It prevents the measuring strip from being completely hidden in the case. But this "little thing" has another purpose related to the convenience of working with a roulette wheel. The hole in the stop helps you measure large lengths alone. To do this, a self-tapping screw is screwed into the right place. The end of the tape is fixed to its cap. Notches on the stop allow you to mark the desired point when marking the surface.
6. Interesting design of a stationery knife
The stationery knife has proven to be a useful invention. The sharp blade easily handles paper, cardboard and even wallpaper. But over time, it becomes dull. There is no need to sharpen it. It is enough just to break off along a special strip applied to the surface of the blade. This can be done in different ways - with hands, pliers. But in the design of the clerical knife there is a special "trick" designed to update the sharp end of the blade. It is located on the opposite side and looks like a stub.
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7. Drawer under the oven
The functional purpose of the drawer under the oven is not only for storing pans and lids. Although he does an excellent job with this task. Initially, the space under the oven was created for a completely different purpose. The drawer was supposed to store cooked food, as well as reheat food if a dish is baked in the oven.
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