《电话》求取 ⇩

Contents1

How telephones began1

How Edison improved on the early telephone4

How the sound of your voice travels6

Sound waves into electric currents7

The Transmitter8

The Receiver9

Telephone exchanges12

Manual exchanges14

Automatic exchanges15

How the selectors work17

Automanual switchboards18

Dialling codes20

Exchange systems23

Long distance telephoning24

Helping the electric currents over long distances26

International services29

Radio-telephones30

The Post Office Tower31

Telephoning by Satellite32

Special services34

Emergency services35

Public services37

Learning more about the telephone38

Vocabulary40

1980《电话》由于是年代较久的资料都绝版了,几乎不可能购买到实物。如果大家为了学习确实需要,可向博主求助其电子版PDF文件(由(英)凯里(Carey,D.)著;刘元吉等注释 1980 上海:上海译文出版社 出版的版本) 。对合法合规的求助,我会当即受理并将下载地址发送给你。