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
41
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:https://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
Chinaisthetopsourcecountryofinternationalstudentsintheworld.Recen
Whenwethinkofgreenbuildings,wetendtothinkofnewones—thekindofh
[originaltext]W:Soundsgood.Thatkindofresponsibilitycanbeintimidatingi
敞开式外廊的二级耐火等级的多层教学楼、位于两个楼梯之间的教室,其房门至楼梯间最大
坚持马克思主义哲学的认识路线,就必须在工作中坚持A.一切从实际出发 B.—切从
A.三七 B.蒲黄 C.茜草 D.白及 E.白茅根既能化瘀止血,又能利尿
共用题干 第二篇Sino-JapanAnimosity(敌意)Lessens
甲、乙、丙三国均为WTO成员国,甲国给予乙国进口丝束的配额,但没有给予丙国配额,
钢筋保护层厚度符合设计和规范要求。受力钢筋保护层厚度的合格点率应达到( )及以
最新回复
(
0
)