Std.7 sst ch.1 question answer

2 . If the Himalayas did not exist     If the Himalayas did not exist, India would be very different. The cold winds from Central Asia would enter India freely, making the climate much colder and drier. Many rivers like the Ganga, Yamuna, and Brahmaputra might not exist because these rivers originate from the Himalayan glaciers. Without the Himalayas, there would be less rainfall, fewer forests, and farming would become difficult in many regions. The northern plains might even look like deserts. The Himalayas also protect India from strong winds and help in bringing monsoon rains, so life in India would be much harder without them. 3. Why is India called a ‘mini-continent’? India is called a “mini-continent” because it has great diversity in physical features, climate, culture, languages, and natural resources, just like a continent. It has mountains in the north, deserts in the west, plains in the center, plateaus in the south, and coastal regions on both sides. Different par...
Post a Comment

Edison light bulb

 Edison light bulb

Edison light bulbs, retroactively referred to as antique light bulbs, and vintage light bulbs, refer to carbon- or early tungsten-filament incandescent lamps, or modern bulbs reproducing their appearance. Most of these bulbs are reproductions of the wound filament bulbs made popular by Edison Electric Light Company at the turn of the 20th century. They are easily identified by the long and complicated windings of their internal filaments, and by the very warm-yellow glow of the light they produce.


Original carbon-filament bulb from Thomas Edison's shop in Menlo Park.

Light bulbs with a carbon filament were first demonstrated by Edison in October 1879. Carbon filament bulbs, the first electric light bulbs, became available commercially in 1879. In 1904 a tungsten filament was invented by Austro-Hungarians Alexander Just and Franjo Hanaman, and was more efficient and longer-lasting than the carbonized bamboo filament used previously. The introduction of a neutral gas to the glass envelope (or bulb) also helped to improve lifespan and brightness of the bulb. To produce enough light, these lamps required the use of extremely long filaments, and remained so until the development of more efficiently wound tungsten filaments.


A glowing vintage light bulb of "ST" shape.

While the intricate filament design never fully left, innovations in energy efficiency outpaced the highly inefficient design quickly. Still, 51 years after more efficient designs had come into play, "Edison-style" or vintage lights saw resurgence in many businesses and homes wanting atmospheric lighting or vintage themes.

Reproductions of the antique bulbs began in the 1980s by Bob Rosenzweig. He began selling the vintage-style light bulbs after watching a salvage operation. The reproductions were sold mostly to collectors and prop houses until the turn of the 21st century, when new regulations banned low-efficiency lighting in many countries. Domestic lighting shifted toward more efficient compact fluorescent lamps and LED lights, and demand for vintage bulbs increased likewise[6] Edison-style incandescent lamps are exempted from the ban in most places as "specialty lighting". Modern "Edison light bulbs" are designed to replicate the same light color and bulb shape to offer a more energy-efficient version of the popular vintage reproduction bulbs. Modern tungsten coils are already more efficient. These bulbs also maintain the same "exposed" look to further preserve the vintage reproduction style, and often employ the "ST" long-pear bulb shape for the same reason. LED bulbs, including LED retro types, are much more energy-efficient than any incandescent lighting.

US inventor Robert (Bob) Kyp patented light bulbs under the name Balafire, and radiometers; the company he ran since 1964, Kyp-Go, is the only US manufacturer of carbon-filament bulbs, which have been used in a commercial.

Comments

Post a Comment

Popular posts from this blog

Magic fingers art

Image
  Magic Fingers Art This is an amazing work like creativity with animated artistic easy drawing... If you have so much time to waste then do it and earn money. If your arts are awesome then do like this Don't waste your time just enjoy your artistic work with joy 😊 😊 😊 😊 
Read more

Humayun's Tomb

Image
Humayun's Tomb Humayun's Tomb is the tomb of the   Mughal Emperor   Humayun   in Delhi, India. The tomb was commissioned by Humayun's first wife and chief consort, Empress   Bega Begum   (also known as Haji Begum),   in 1558, and designed by Mirak Mirza Ghiyas and his son, Sayyid Muhammad,  Persian  architects chosen by her.   It was the first garden-tomb on the   Indian subcontinent ,   and is located in   Nizamuddin East , Delhi, India, close to the   Dina-panah   Citadel, also known as   Purana Qila   (Old Fort), that Humayun found in 1533. It was also the first structure to use red sandstone at such a scale.   The tomb was declared a   UNESCO World Heritage Site   in 1993,   and since then has undergone extensive restoration work, which is complete.   Besides the main tomb enclosure of Humayun, several smaller monuments dot the pathway leading up to it, from the main entrance in ...
Read more

Haunted place around the world

Image
  1. Château de Brissac, Maine-et-Loire, France Château de Brissac is a castle located in the commune of Brissac-Quincé, the department of Maine-et-Loire, France. The castle is recorded to have been built during the 11  th  century, and has a long and interesting history. Like many castles around the world, the Château de Brissac is said to possess its own resident ghost. This is the ‘la Dame Verte’ or Green Lady, who is said to be the ghost of an unfaithful wife murdered by her husband during the 15  th  century. Castle’s History Dubbed as the ‘tallest castle in France’, the Château de Brissac is said to have originally built as a castle by the Counts of Anjou during the 11  th  century. During the 15  th  century, the château was rebuilt as a fort-like structure by one of Charles VII’s ministers. During the French Wars of Religion, which broke out during the 16  th  century, the château was made into his possession by Henry of Nav...
Read more