I recently happened upon an old film of an Australian Ham Radio Station {VK3BB} on operating in the 1950's
It is a club station with uniformed high school students participating.
A reliable source { VK2EVB and VK2XFL (whose father was involved with the production of these films)} indicate the film was made by the Visual Education Department of the Melbourne Technical College (later renamed RMIT in 1960).
They made 16mm films and phono disks for Primary and Secondary Schools in Victoria.
Also, the State Film Centre would provide projection film equipment and staff to the School classes to show these 16mm films.
I had attended the same Youth Radio Scheme club station (although many years later than the film shows).
The club (later licensed as VK3ANL) was mentored by the school science teachers, and operated by a local radio amateur : Mr Bert Budge VK3BB (SK)
He is the one at the microphone, working Chicago area station K9PTQ
A 1996 Australian callbook still shows a listing for A E Budge VK3BB
An early club project was to construct a multi-channel, active (means valves) Audio Mixer.
This would allow several students a microphone each to speak into whilst 'on-air'
The mixer o/p is fed into the transmitter.
This is what I feel the people seated around the table are doing.
I relish the loud 'clunk' of some contactors you hear when the PTT button is released!
Bert was the first person I ever met (c1963 at a craft/hobby exhibition) who had a ham-shack at his home and frequently communicated world-wide with other radio hams!
Needless to say; as a youngster, I was astounded that such a thing could actually be possible!
Very few homes even had a telephone - such a thing deemed necessary only for the likes of doctors, public officials, business people etc.
Bert was also our local Butcher.
Because of his efforts in promoting Amateur Radio to young people,
I suppose he would satisfy the persona of what Americans call an "ELMER"
Joe-WB1GFH's website gives this:
What's an ELMER?
An Elmer is a MENTOR, teacher and friend that helps someone obtain their amateur radio license.
Most hams do not go it alone but instead earn their tickets with the help of a good Elmer.
The term "Elmer" came from the stereotype of the bespectacled, erudite ham-next-door that many all-American youngsters got their first exposure to amateur radio from.
Many were named Elmer, Jasper, Clyde, or something equally nerdy.

The word ELMER never seemed to appear in the Australian (Ham) vernacular, but we all know what it means.
In Australian-ese: that crazy guy who stays up all night and lives in the house with all those aerials on the roof !!!
(and is the cause of ALL our television reception inteference !!!)

The graphic below includes some screen grabs from the 40 sec video, in which I have tried to enhance, so as to get some info from the blackboard at rear.
From the US, UK and Pacific loggings one can only summise that they were enjoying good DX working conditions, which historically we know prevailed with the extreme sunspot peak of 1957 and thereabouts.
In my time at the club the "gear" was a matching Italian Geloso G209/G222 AM receiver and transmitter.
Probably funded by the Education Dept, tabletop size (more compact than the transmitter in the film)
These were magnificent looking units with large illuminated sweep dials - now much treasured by collectors


Having explained the term "Elmer" other related descriptive-nouns may be shown by use of the following Venn diagram :