Dictater

The dictater frequently misreads or mistalks a word. If the error is plain, and leaves no room for doubt that it is an error, don't copy that error.

Source: wiktionary

When, however, in any particular case, he has no assured means of determining the true spelling of the name, he should always quietly interrupt the dictater with the request, " Spell it , please," and then write the name in longhand from the dictater's spelling.

Source: wiktionary

On the other hand, an embossed system involves less of the dictater's time (which is presumably more expensive) than of the secretary's time.

Source: wiktionary