"If so, then yes, so this is.

Only this is as far in advance of wireless telegraphy, as telegraphy is in advance of the semaphore.

This is a science beyond your knowledge, that is all.

Name another city." "Timbuctu," I said suddenly; and nothing happened.
"Mombasa," I said then, and Mombasa appeared instantly, with Kilindini harbor fringed with palm-trees.
I had been to Mombasa, whereas I never had seen Timbuctu.

Almost certainly none present had ever seen the place, or even a picture of it.
The Gray Mahatma said something in a surly undertone and the golden light turned itself on again, flooding the whole chamber.