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
34
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、1727.
B、1826.
C、1839.
D、1860.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3003000.html
相关试题推荐
[originaltext]W:Goodmorning,HousingOffice.HowcanIhelpyou?M:Hi,I’m
[originaltext]W:Goodmorning,HousingOffice.HowcanIhelpyou?M:Hi,I’m
[originaltext]M:Whenistheassignmentdue?Andwhattypeofreportdoyouwan
[originaltext]M:Whenistheassignmentdue?Andwhattypeofreportdoyouwan
[originaltext]M:Whenistheassignmentdue?Andwhattypeofreportdoyouwan
[originaltext]M:Whenistheassignmentdue?Andwhattypeofreportdoyouwan
[originaltext]Thepovertylineisthelowestincomethatpeopleneedforan
[originaltext]Thepovertylineisthelowestincomethatpeopleneedforan
[originaltext]Thepovertylineisthelowestincomethatpeopleneedforan
[originaltext]Senatorsarepeoplewhoareelectedevery6yearsandtheyre
随机试题
Obesityisdefinedasbodyweightof15percentormoreabovetheidealfor
[originaltext]Nuclearradiationhasacertainmysteryaboutit,partlybeca
女性,1岁,发热、呕吐2天,食欲下降,有尿时哭吵,无惊厥,既往无类似病史。查体:
单纯性甲状腺肿若要确定喉返神经有无受压需要做的检查是A、BMR B、PBI
A.精神分裂症B.便秘C.高血压D.胆道蛔虫症E.脑缺血属于泽泻的现代应用是
Ⅰ型超敏反应的效应细胞包括A:嗜碱性粒细胞、肥大细胞、活化T细胞B:肥大细胞、
Thechangeinthatvillagewasmiraculou
甲苯磺丁脲临床适应证是A:幼年型糖尿病 B:轻、中型糖尿病 C:完全切除胰腺
房产分户图主要内容有( )。A.控制点 B.宗地代码 C.房屋结构
求助者一般资料:女性,26岁,家庭主妇。 案例介绍:求助者半年以前结婚,结婚
最新回复
(
0
)