Our nickel tour doesn't do justice to GA mechanics, but even a longer explanation would leave us scratching our heads and asking how such simple operators might do anything useful, let alone promote an effective, robust search for good stuff.

a street cat; a street urchin

The angle-of-attack error indicator, located to the right of the attitude eight-ball, requires some explanation.

[…] with the necessary looplines to avoid the broad gauge points at the intermediate stations, with a view to the direct transit of goods traffic along the Northern Railway and its extensions.