Transmitting Pictures by Telephone

Pictures can now be sent over the telephone by sound signals. A new machine does this by looking at a picture and telling what it sees over the telephone to a similar machine at the receiving end, which then translates the sound signals it hears back into the form of a picture.

At the sending end, the photograph, drawing business form or document is placed in the machine. At the receiving end, the reproduction appears on ordinary paper. An illustration of ordinary letter size takes six minutes to be received and reproduced.

This is how the machine works. Inside the machine optical devices rotate and pick up reflected light which is focused on and passed through a filter to a photocell or «electronic eye». The photocell generates a signal which is amplified to produce voltages of varying strength.

The voltages are converted into sound, and it is this audible signal which is transmitted over the telephone, just as music or voice transmitted.

At the receiving telephone, the sound is reconverted to an electronic signal and then into a varying voltage. This voltage is applied to a drive mechanism. The mechanism is activated to extend and print out a corresponding dark area of the transmitting picture. The length of the document determines the time needed for transmission.

Вариант 5

1. Перепишите и письменно переведите на русский язык следующие предложения. Помните, что объектный и субъектный инфинитивные обороты соответствуют придаточным предложениям (см. образец выполнения 1).

The teacher does not consider him to be a good student.

Steel production is expected to rise this year.

Plastics are supposed to be used instead of metals in many cases.

They will need much concrete to be used for soil stabilization.

2. Перепишите и письменно переведите на русский язык следующие предложения. Обратите внимание на перевод зависимого и независимого (самостоятельного) причастных оборотов (см. образец выполнения 2).

Weather permitting, the plane will leave early in the morning.

He works hard to pass his entrance examinations, his sister doing her best to help him.

Having offered them to work abroad he himself refused.

3. Перепишите и письменно переведите на русский язык следующие предложения. Обратите внимание на перевод условных предложений (см. образец выполнения 3).

If I came earlier I should speak to him.

If he had seen you here he would be surprised.

If he had taken a taxi, he would have come in time.

4. Прочитайте и устно переведите с 1-го по 5-й абзацы текста. Перепишите и письменно переведите 1, 2, 3, 4-й абзацы.