Just for your reference, here is the quote from "Whisperer in the Darkness" describing the cylinders.
"There, in a neat row, stood more than a dozen cylinders of a metal I had never seen before - cylinders about a foot high and somewhat less in diameter, with three curious sockets set in an isosceles triangle over the front convex surface of each. One of them was linked at two of the sockets to a pair of singular-looking machines that stood in the background. Of their purport I did not need to be told, and I shivered as with ague. Then I saw the hand point to a much nearer corner where some intricate instruments with attached cords and plugs, several of them much like the two devices on the shelf behind the cylinders, were huddled together.
"There are four kinds of instruments here, Wilmarth," whispered the voice. "Four kinds - three faculties each - makes twelve pieces in all. You see there are four different sorts of beings represented in those cylinders up there. Three humans, six fungoid beings who canÂ’t navigate space corporeally, two beings from Neptune (God. if you could see the body this type has on its own planet.), and the rest entities from the central caverns of an especially interesting dark star beyond the galaxy. In the principal outpost inside Round Hill youÂ’ll now and then find more cylinders and machines - cylinders of extra-cosmic brains with different senses from any we know - allies and explorers from the uttermost Outside - and special machines for giving them impressions and expression in the several ways suited at once to them and to the comprehensions of different types of listeners. Round Hill, like most of the beingsÂ’ main outposts all through the various universes, is a very cosmopolitan place. Of course, only the more common types have been lent to me for experiment.
"Here - take the three machines I point to and set them on the table. That tall one with the two glass lenses in front - then the box with the vacuum tubes and sounding-board - and now the one with the metal disc on top. Now for the cylinder with the label ‘B-67’ pasted on it. Just stand in that Windsor chair to reach the shelf. Heavy? Never mind. Be sure of the number - B-67. Don’t bother that fresh, shiny cylinder joined to the two testing instruments - the one with my name on it. Set B-67 on the table near where you’ve put the machines - and see that the dial switch on all three machines is jammed over to the extreme left.
"Now connect the cord of the lens machine with the upper socket on the cylinder - there. Join the tube machine to the lower left-hand socket, and the disc apparatus to the outer socket. Now move all the dial switches on the machine over to the extreme right - first the lens one, then the disc one, and then the tube one. ThatÂ’s right. I might as well tell you that this is a human being - just like any of us. IÂ’ll give you a taste of some of the others tomorrow." "
I hope it helps...
