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
2023-09-10
71
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://www.tihaiku.com/zcyy/3002999.html
相关试题推荐
[originaltext]RecentlytheDepartmentofPlanningofNewYorkissuedarepo
[originaltext]RecentlytheDepartmentofPlanningofNewYorkissuedarepo
[originaltext]Howdoyourisetothetopinbusiness?Whatpersonalqualifi
[originaltext]M:Sowhat’syourtrouble?W:Well,doctor,,Ihaven’tbeenfeeli
[originaltext]M:Sowhat’syourtrouble?W:Well,doctor,,Ihaven’tbeenfeeli
[originaltext]W:Didyouseethecollegenewspaper?Theywriteaboutourvoter
[originaltext]W:Didyouseethecollegenewspaper?Theywriteaboutourvoter
[originaltext]W:Didyouseethecollegenewspaper?Theywriteaboutourvoter
[originaltext]W:Didyouseethecollegenewspaper?Theywriteaboutourvoter
[originaltext]W:Didyouseethecollegenewspaper?Theywriteaboutourvoter
随机试题
Theenergycontainedinrockwithintheearth’scrustrepresentsanearlyun
应届毕业生graduatingstudent;currentyear’sgraduate
滨河湿地占一级流域湿地总面积比例最大的河流是:() A.淮河 B.黄河
共用题干 某开发商为促销楼盘,在醒目位置贴出告示:“新房上市,10月1日开始出
A.1.5 B.1.7 C.1.9 D.2.1
我国个人定期存款分为四类,其中零存整取类型的起存金额为()。A.50元
程序化策略中()是模型设计与构建的核心。A.模型的通用性 B.模型适用的周期
一般保证的保证人未约定保证期间的,保证期间为主债务履行期届满之日起()个月A.6
下列哪项不是引起管样呼吸音的因素A.肺组织实变 B.肺脓肿 C.压迫性肺不张
患者,男,20岁。3年前无明显诱因渐起孤僻少语,不愿参加集体活动,甚至与父母也很
最新回复
(
0
)