首页
登录
职称英语
[originaltext] Today I will be talking about the invention of the camera and
[originaltext] Today I will be talking about the invention of the camera and
游客
2023-09-15
12
管理
问题
Today I will be talking about the invention of the camera and photography.
Camera is often thought to be a modern invention. But as early as 1727, a German physicist discovered light darkened silver salt, a chemical compound used as a camera, a big box with a small hole to let the light in, he made temporary images on the salt. Silver salt is still the basic film today. Then a French scientist made the first permanent picture by using a special piece of metal sensitized with silver salt. A photograph photograph he made in 1826 still exists.
The painter DeGair improved on the process by placing common salt, the kind we eat, on the metal. This was in 1839, the official date of the beginning of photography. But the problem was the printing of the photographs. And it was not until other scientists developed the kind of paper we now use that good printing was possible, and photography became truly modern.
In the 1860’s, Mathew Brady was able to take his famous pictures of the American Civil War, thus making portrait poses very popular. In the 20th century, George Eastman of the United States simplified film developing, and Edwin Land invented the so-called instant camera with self-developing film.
If we say photography came into existence in 1839, it follows that it has taken more than 100 years for the camera to reach its present condition of technical refinement.
选项
A、special paper.
B、silver salt.
C、common salt.
D、a special metal.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3015518.html
相关试题推荐
[originaltext]W:Goodmorning.M:Goodmorning.I’dliketobuytwoticketsfo
[originaltext]W:Goodmorning.M:Goodmorning.I’dliketobuytwoticketsfo
[originaltext]M:Thetrainleavesevery30minutes.You’refiveminuteslatefo
[originaltext]M:Thetrainleavesevery30minutes.You’refiveminuteslatefo
[originaltext]M:Thetrainleavesevery30minutes.You’refiveminuteslatefo
[originaltext]M:IfoundthatlivinginJarjan,peoplewerebusier.Theyseemt
[originaltext]M:IfoundthatlivinginJarjan,peoplewerebusier.Theyseemt
[originaltext]M:IfoundthatlivinginJarjan,peoplewerebusier.Theyseemt
[originaltext]W:CanIcometoseeyouat10:00,ProfessorBrown?M:I’msorry
[originaltext]W:CanIcometoseeyouat10:00,ProfessorBrown?M:I’msorry
随机试题
中国园林几个世纪以来,中国在自然中寻求灵感和自我认知。因此,中国园林倡导回归自然世界。由于城市
Whatisthepassagemainlyconcernedwith?[br]Theword"unwieldy"inthesecon
HowAdvertisementIsDone?A)Whenwechooseawordwedomorethangive
固体分散物的载体材料对药物溶出的促进作用包括A.载体材料对药物有抑晶性 B.水
根据《建设工程施工合同(示范文本)》GF-2017-0201,合同文本由()
A.2%~4%碳酸氢钠溶液 B.温水或生理盐水 C.3%过氧化氢溶液 D.
2011年国内生产总值为()亿元。 A.469793.8 B.42368
“四五运动”最重要的意义在于 A.控诉“四人帮”的罪恶 B.沉痛悼念周恩来总
江南一带的山水,一方面是坡势平缓的丘陵山地,水波不兴的江河湖泊,另一方面茂林修竹
王某因追索工资与所在公司发生争议,遂向某法律工作者咨询。该法律工作者的下列观点中
最新回复
(
0
)