Skip to main content

What is a Foghorn and How does it work?

Most often used in foggy conditions, is a device that uses sound to warn vehicles of hazards. Generally marine transport is using the term. When lighthouses are obscured the foghorn provides an audible warning of any dangers to ships. Robert Foulis created the first automated steam-powered foghorn. After hearing his daughter play piano in the fog, he realized the lower notes were more audible. So he designed a device to produce a low frequency sound. His fog signal was installed on Partridge Island in 1859; however, Foulis was in legal battles over his invention for the rest of his life. Celadon Leeds Daboll created a coal-powered foghorn that few lighthouses are using.




Foghorns use a vibrating column of air to create a tone although note all vibrations are resulting from the same method. Some use vibrating plates or metal reeds similar to a car horn. Others are similar to a siren where the air is entering through holes in revolving cylinder or disk. Semi-automatic foghorns work using a clockwork mechanism that opens the valve admitting air to the horns. Stevens Automatic Bell Striker was one of the first automated fog bells.


Through the use of laser beams the automated process works by detecting ships out at sea and if the beam reflects back the foghorn activates. Foghorns have also been used on railway lines in order to warn of dangers on the line.

Popular Posts

What is the role of Engine Oil in Vehicles?

Engine oils play a crucial part in your engine’s functionality. Without the oil, your engine can become damaged fairly quickly and so it’s in your best interest to make sure that the engine oil is up to par. The oil in your engine makes sure that the all mechanical components are lubricated to reduce friction, wear and heat. The engine oil ensures that components don’t rub against each other and wear away. While it depends on how often you use your car, older engine oil doesn’t perform as well and so a regular change in engine oil is essential to the functionality of your car.

Why is there a groove line on the "F" and "J" keys on keyboards?

The bumps or nipples found on the F and J keys on the keyboard helps users correctly position their left and right hand on the keyboard without having to look at the keyboard. For example, without looking at your keyboard you should be able to feel the keyboard and correctly position your left index finger on the F and the right index finger on the J. From this position, you should be able to locate the remainder of the keys on the keyboard. A phone having a hardware numeric keypad has something similar. The digit 5 also has a bump. It is also used for the same purpose. One can easily and quickly enter the digits without having a look at the keypad.

What is TrichoScan?

Quantitative methods for the analysis of human hair growth and hair loss are necessary for patient follow-ups or to determine the efficacy of hair growth promoting drugs.  While reviewing the capabilities of the different methods, the common theme emerges that most techniques are of little practical use to the clinician because they are time consuming, costly, or difficult to perform. An operator- and patient-friendly, inexpensive, validated, and reliable method for assessing hair growth was therefore a rational need.  With TrichoScan, such a tool is now available. TrichoScan is a software-based method for the analysis of human hair. For this purpose, digital images are taken from the scalp with a specially developed camera-optics system. TrichoScan software is then used to automatically calculate important parameters of hair growth, such as hair density or thickness from the images.

Contact Lenses Made of 👁️

There are three main categories of contact lenses, based on the materials they are made of: soft contacts, rigid gas permeable (GP) contacts, and hybrid contact lenses. Soft contacts are made of pliable hydrophilic ("water-loving") plastics called hydrogels. Hydrogels absorb significant amounts of water to keep the lenses soft and supple. Because of this water-loving characteristic, the water content of various hydrogel contact lenses can range from approximately 38 to 75 percent (by weight). The water content of soft lenses allows oxygen to pass through the lenses and keep the cornea healthy during contact lens wear. Gas permeable contacts, also called GP or RGP lenses, are rigid (hard) contact lenses. Like hydrogels used for soft lenses, materials used to create GP contact lenses also are "gas permeable," allowing oxygen to pass through the lenses to the cornea. Unlike soft lenses, however, rigid gas permeable lenses do not contain significant amounts of water. In

Why do Oil rigs have a Flame?

The flame at the top of an oil rig is an iconic image for the Oil & Gas Industry, yet few people understand why companies choose to burn natural gas. By burning excess natural gas, flaring protects against the dangers of over-pressuring industrial equipment. A gas flare, alternatively known as a flare stack, flare boom, ground flare, or flare pit is a gas combustion device used in industrial plants such as petroleum refineries, chemical plants and natural gas processing plants. Flaring is undertaken as a way to remove dangerous gasses with lower harm to the environment. It is used in safely regulating pressure in chemical plants, as well as handling natural gas release in wells. Alternatives, such as piping the gas to a plant or on-site capture and use, are of great interest.

APPLE IOS 14 NEW UPDATE

  YOU HAVE TO WAIT FOR NEW IOS 14 UPDATE IN INDIA. Here’s the cheat sheet: Hawaii:  7 a.m. Alaska:  9 a.m. California and the rest of the Pacific coast, Arizona, Vancouver:  10 a.m. Colorado, Wyoming, Montana:  11 a.m. Texas, Missouri, Wisconsin:  12 p.m. New York, North Carolina, Florida, Toronto:  1 p.m. Brazil:  2 p.m. The United Kingdom, Portugal:  6 p.m. Germany, France, Spain, Italy, Norway, Sweden, Algeria, Angola:  7 p.m. Moscow, Finland, Turkey:  8 p.m. India:  10:30 p.m. China, Singapore, Hong Kong:  1 a.m., September 17 Perth, Australia:  1 a.m., September 17 Japan, South Korea:  2 a.m., September 17 Adelaide, Australia:  2:30 a.m., September 17 Sydney, Australia:  3 a.m., September 17 New Zealand:  5 a.m., September 17