"Not just depositing visiting cards but ensuring that they were printed in the correct (embossed) format. And then when and where to leave them suitably annotated with the cabalistic " ppc" the meaning of which I've happily forgotten."
As well as of course remembering to also turn up one corner of the card so that the lady of the house would have no difficulty in picking it up off of the salver.
As was taught at Sleaford Tech. as late as 1968.