首页
登录
职称英语
The first permanent picture was made by using [originaltext] Today I will be
The first permanent picture was made by using [originaltext] Today I will be
游客
2023-11-20
25
管理
问题
The first permanent picture was made by using
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. 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 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 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/3204921.html
相关试题推荐
Howmanyattacksandclasheswerereportedinthisnews?[br][originaltext]
Accordingtothecourtruling,Israelhasto[originaltext]TheInternational
Wheredoesthisconversationmostlikelytakeplace?[br][originaltext]M:Hell
Whatisthemaintopicofthisconversation?[br][originaltext]M:Weseemtob
Whatisthemaintopicofthisconversation?[br][originaltext]M:Weseemtob
[originaltext]LetChildrenLearntoJudgeTheirOwn
______werereportedbytheweatherstationinChicago.[br][originaltext]
______werereportedbytheweatherstationinChicago.[br][originaltext]
Howmanycarsaretowedfromthestreetseachyear?[br][originaltext]One
Howmanycarsaretowedfromthestreetseachyear?[originaltext]Oneofth
随机试题
NaturemagazineconcludedthatthelossofakeysegmentofDNAcan【C1】_____
[originaltext]M:Hello,Prof.Diana,youwantedtoseeme?W:Oh,yes,Frank.T
我国招投标应当遵循的原则是()。A、公开 B、公平 C、公正 D、科
特种作业人员的资格条件要求有()。A、具备相应工种的安全技术知识 B、具有5年
患儿,女,9个月,人工喂养,家长发现孩子最近较烦躁、多汗来诊。体检发现方颅、鸡胸
中毒型痢疾多见于A.新生儿 B.婴幼儿 C.儿童 D.青年 E.成人
监控防误系统应具有完善的全站性防误闭锁功能。接入监控防误系统进行防误判别的断路器
“大约有95%的可能性真分数落在所得分数±1.96SE的范围内,或有5%的可
根据《中华人民共和国进出口商品检验法》有关规定,法定检验进口商品的收货人或其代理
最新回复
(
0
)