首页
登录
职称英语
[originaltext] Today, I’ll be talking about the invention of the camera and
[originaltext] Today, I’ll be talking about the invention of the camera and
游客
2024-06-04
53
管理
问题
Today, I’ll be talking about the invention of the camera and photography. The camera is often thought to be a modem invention. But as early as 1727, a German physicist discovered that light darkens silver salt, a chemical compound. Using as a camera, a big box with small hole to let the light in, he made temporary images on the salt. Silver salt is still the base of film today.
Then a French scientist made the first permanent picture by using a special piece of metal sensitized with silver salt. A photograph he made in 1826 still exists. The painter, Daguerre improved on the process by placing common salt 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 wasn’t until other scientists developed the kind of paper we now use, that good printing was possible and photograph became truly modern.
In 1860’s, Matthew Bradey was able to take his famous pictures of the American Civil War. In the 20th century, George Eastman of the Untied States simplified film developing, and Dr. Edwin Land invented the so-called "instant" camera with self-developing film. If we say that photography came into existence in 1839 it follows that it has taken more than one hundred years for the camera to reach its present condition of technical refinement.
选项
A、Light darkens silver salt.
B、Light darkens natural salt.
C、Light darkens silver.
D、Light darkens self-developing film.
答案
A
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3619265.html
相关试题推荐
[originaltext]Somepartsoftheeartharemorelikelytohavequakesthano
[originaltext]Somepartsoftheeartharemorelikelytohavequakesthano
[originaltext]TheGoldenGateBridgejoinsthebeautifulcityofSanFranci
[originaltext]TheGoldenGateBridgejoinsthebeautifulcityofSanFranci
[originaltext]Everycountrytendstoacceptitsownwayoflifeasbeingth
[originaltext]Everycountrytendstoacceptitsownwayoflifeasbeingth
[originaltext]W:Whatareyoudoingthisterm?M:Oh,I’mstillstudyingEnglis
[originaltext]W:Whatareyoudoingthisterm?M:Oh,I’mstillstudyingEnglis
[originaltext]Areyouafraid,toraiseyourhandinclass,evenwhenyoukn
[originaltext]M:Hey,Howwasyourtrip?W:Itiswonderful!Ispentmostofmy
随机试题
What’sthetimenow?[br][originaltext]M:When’stheshowsupposedtostart?W
由于革命斗争的日益残酷,列宁认识到有“铁的纪律”,是取得革命胜利的基本条件,强调
软件测试可分为静态测试和动态测试,以下不属于静态测试的是()。A.代码检查
关于婴幼儿生长所需能量,以下哪种说法是不正确的()。A.生长的能量消耗为
下列材料中,()俗称马赛克。A.花岗石 B.合成石面板 C.瓷质砖
A.风气内动 B.寒从中生 C.湿浊内生 D.津伤化燥 E.火热内生邪热
弗氏完全佐剂的组成包括()。A.液体石蜡、羊毛脂、卡介苗 B.液体石蜡、
企业采用下列哪种预测方法对人力资源需求进行预测时,有关变量的历史数据必须是全面的
下列选项中,反映中国传统职业道德的精华的内容是()。A.公忠为国的社会责任感
下列选项中,可以进行抵押的财产有()。 A.土地所有权 B.高等
最新回复
(
0
)