...Even the sonoflector was recording; its invisible rays were dartingdownward to be reflected back again from the surface below... 
Various 「Astounding Stories, August, 1931」
...Lane reached out his hand to the dial, invisible to Mich'l, whichoperated the telucid apparatus, and immediately the apparitionsvanished...
Various 「Astounding Stories, August, 1931」
...The invisible rays, ultra-violet and such, are present in fullproportion...
Various 「Astounding Stories, August, 1931」
...It would be invisible to me then, butan hour later when I would be at 3 P...
Various 「Astounding Stories, August, 1931」
... The hum of the invisible swarms was buzzing incessantly...
Vicente Blasco Ibanez Charlotte Brewster Jordan 「The Four Horsemen of the Apocalypse」
... He was no longer afraid of the shrill shrieks of invisible bodies...
Vicente Blasco Ibanez Charlotte Brewster Jordan 「The Four Horsemen of the Apocalypse」
... He felt the approach of the invisible projectile, in spite of the roar of the neighboring cannon...
Vicente Blasco Ibanez Charlotte Brewster Jordan 「The Four Horsemen of the Apocalypse」
...The door moved upon invisible hinges, and Fouquet appeared...
Alexandre Dumas, Pere 「Ten Years Later」
...That corner of his cell, the recess wherein stood the table, was invisible to any one who had not actually crossed the threshold...
Baroness Orczy 「El Dorado」
...Darkness was drawing in on every side like a wide, black mantle pulled together closer and closer overhead by invisible giant hands...
Baroness Orczy 「El Dorado」
...No doubt fresh air was pouring in continually through some shaft in the rock, but the shaft was invisible...
Talbot Mundy 「King--of the Khyber Rifles」
...They were dug deep enough to require very little earthwork for protection; hence they were more or less invisible by the enemy in their larger trenches...
Lady Sarah Wilson 「South African Memories」
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