Centaurus.
I did my Viscount school with Ansett-ANA in 1964 at Essendon.
Can well remember the two fellows you mentioned , Roger Gabriel and Ray Lancaster both exceptionally well regarded and had so much knowledge of their subjects.
In later years during our B727 ground school Ray's famous words when discussing an intricate part of a fuel system was that after fuel passed this piece it went into a " PFM Box ".
PFM stood for " Pretty Fuc#ing Magic " and that's all you need to know about it.
Things were quite different in the early days as we were taught every detail of the system which was too much info.
Exams were all hand written with NO multi choice questions at all and the school on the B727 took 6 weeks , can't remember the Viscount school but it was a long time.
How things have changed!!!!