like some intolerable compound out of a penny-in-the-slot machine

Through the tepid air the scent streamed from the frangipani trees like some intolerable compound out of a penny-in-the-slot machine.

The sentence above is from Burmese Days whose events take place in Burma in the 1920’s. The narrator here is describing the scene in a European club in a Burmese village, and I wish to understand what is meant by the part in bold, or rather if the machine referred to here is the vending machine, and in this case what is that “intolerable compound” they release?

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