首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
What discovery was the basis of photography?
What discovery was the basis of photography?
admin
2012-08-21
29
问题
What discovery was the basis of photography?
Today,I’ll be talking about the invention of the camera and photography. The camera is often thought to be a modern invention. But as early as 1727,a German physicist discovered that light darkened silver salt, a chemical compound. Using 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 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 photography he made in 1826 still exists. The painter Dagger 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 wasn’t until other scientists developed the kind of paper we now use that good printing was possible and photography became truly modern. In 1960’s Matthew Brady was able to take his famous pictures of the American Civil War,thus making portrait poses very popular. In the 20th century,George of the United States simplified film-developing,and Edwards Land invented the so-called instant camera with self-developing film. If we say that the photography came into existence in 1839, it follows that it has taken more than one hundred years for the cameras to reach its present condition of technical refinement.
选项
A、By making use of special paper.
B、By adding common salt to silver salt.
C、By using a special piece of metal.
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/K8wd777K
本试题收录于:
公共英语二级笔试题库公共英语(PETS)分类
0
公共英语二级笔试
公共英语(PETS)
相关试题推荐
—WasthedrivingpleasantwhenyouvacationedinMexico(墨西哥)lastsummer?—No,it______forfourdayswhenwearrivedsotha
Accordingtothepassage,treesaredescribedasallofthefollowingexcept______.Fromthepassage,welearnthatalmosteve
Whichofthefollowingisthebesttitleforthepassage?Accordingtothepassage,thepressureonabuildingduringatornad
Onetypeofstudentwhodecidesto【S1】______attendtocollegeistherecenthighschoolgraduate【S2】__
He______hisexaminationifheworkedharder.
You’restandinginthekitchenandavoicesays,"Addalittlemoresalttothatsoup."Yes,it’salwaysnicetohavesomeonehe
假定你是李明,你的英国朋友Dave与你在同一个城市工作。你去邀请他和你一起参加一个中国画展。他不在,请你根据以下要点给他写个留言条。要点:1.介绍画展.中国画.历代名画展.展期:本月8日至18日.地点:艺术博物馆2.约定会面的地点和时间注意
______writingalettertothemanager,hedecidedtotalktohiminperson.
Youarenotallowedtoparkyoucarhere.Ifyou______ithere,Iwillcallthepolice.
"Howmanymoneyisinyourpiggybank?"Mr.76______HallaskedJoy."Idon’tknow.Butit’sheavy.""Howaboutyou,Tim?Haveyo
随机试题
吴伟业《圆圆曲》“鼎湖当日弃人间,破敌收京下玉关”,其中第一句是指()
社会主义初级阶段的中心任务是进行经济建设,因而坚持四项基本原则和改革开放就显得无关紧要了。()
主动脉瓣狭窄可引起
司机患者不宜选用的药物剂型是()。
胡某于2006年3月10日向李某借款100万元,期限3年。2009年3月30日,双方商议再借100万元,期限3年。两笔借款均先后由王某保证,约定为连带保证,未约定保证期间。李某未向胡某和王某催讨。胡某仅于2010年2月归还借款100万元。关于胡某归还的10
常用在架空管、桥管上,用以调节因环境温度变化而引起的管道膨胀与收缩的燃气系统附属设备是()。
出境的交通工具和人员,必须在户口所在地的国境口岸接受检疫。( )
根据下列教学信息和学生概况,设计一节英语课的教学方案。该方案应突出以下要点:teachingobjectivesteachingcontentskeyanddifficultpointsmajorstepsandtimeallo
甲到乙处修理汽车,由于所携带的钱款不足,将自己的名贵手表留于乙处,双方商定甲次日付款取表。则乙对甲的手表享有()。
A、Hemadeithimself.B、Hehadacarpentermakeit.C、Heboughtit.alongtimeago.D、Hehadanoldonere-made.B从男士的回答中可找到答案。
最新回复
(
0
)