What this kids where doing?
 

Looking for an certain "Kodak" 16 m.m. filming I found this: https://www.youtube.com/watch?v=LE1kE0-yNW8
Those kids look like they are using some teleprinters ("Teletype Corporation"), but there are some math excersing they are doing. Could be that those teletypewriters where connected to an computer - "Teletype" Model 33 could use A.S.C.I.I. interface, so they could be connected to an computer.
But the filming looks like early '60's... an A.S.C.I.I. camed in 1967. Or did they still dressed like that in 1967-1970?

Interesting footage
 

Good question! I would think this probably dates from the late 1970's. In my senior year of high school (1981) we got a computer in the library, and no one had a clue what to do with it. I can't imagine an elementary school having a computer prior to the mid-late 80's at the earliest, so what this actually is who knows? The teletypes would have been used to interface with a mainframe, so again, super expensive and hard to imagine in an elementary school. Such setups were still in use in colleges in the early 80's here. Perhaps the kids were visiting a college computer lab?

I wonder if they were remote linked to a mainframe....ISTR hearing some underutilized business mainframes had computational time/capacity leased to educational institutions.

In my school system, we had computers by 1979-1980. I was using and repairing Apple II + computers in 1982-1983, electronics teacher also was the Apple dealer repair technician.

Don't forget that two kids named Paul Allen and Bill Gates got their start when the Parent-Teacher Council put their pennies together and rented a timeshare on a local system. Time sharing was indeed expensive but not outside of the realm of a school to use, especially if one connection was rented and the teletype was shared among multiple schools using a Modem connection. At 1:45 you can clearly see two Bell datasets stacked in the corner.

A teletype is merely an electromechanical terminal. It could only handle math if connected to a computer.

So those dataset where made in order for a telex machine to communicate to an computer?

That basically was it.
It allowed remote locations to use a telephone line as a connection to the central computer as opposed to purchasing or leasing a private line.

Now do not get too comfortable with the name "Telex". It refers to a company and a a switched network that often operated alongside analog telephone but because Telex predated the modem it was not compatible until years later. This is a good time to read the wikipedia page.

I know telephone lines are using 48 Volts and Telex had +60/-60 Volts.

Hard to date but I think late 60's .
We had 2 computers in high school about 1972. One was in the office
for tracking grades, attendance, & scoring some tests.
The other was in the computer club. It was kept in the math class.
DEC was headquartered in the next town Maynard, Ma. & they donated
it. IIRC it only had a teletype type interface. I had zero interest in computers
but the DEC employees were well off so I made much $$ off them:banana:

73 Zeno:smoke:
LFOD !

I would date the film from mid '60s to the late '60s...

Apple IIe from 1990-93 here, upper elementary. Once I got to junior high (same building) I was stuck mostly with compact Macs. I hated the change and usually wouldn't use them if I could avoid it. The Apples were still used in the elementary wing until I left for high school at least.

These days I'm almost as stubborn.

I'm curios, "Teletype Corportaion" Model 33 used the standard baudot code for punched taped or they made a modified heptavalent code?

From https://en.wikipedia.org/wiki/Teletype_Model_33

"The Model 33 was one of the first products to employ the newly standardized ASCII code. A companion Model 32 used the more established five-level Baudot code. Because of its low price and ASCII-compatibility, the Model 33 was widely used with early minicomputers."

Does this explain it?

the Model 33 ASR, (Automatic Send and Receive), which has a built-in 8-level punched tape reader and tape punch;

As far as I can see, model 33 had some lower specification comparing to other teleprinters.