This electric strain is certainly not of the nature of a compression in the ether, but much more akin to a twist or rotational strain in a solid body.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming
We postulate, therefore, the following ideas: We have to think of the ether as a homogeneous medium in which a strain of some kind, most probably of a rotational type, is possible.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming
In one second Jupiter rotates through a certain angle; we multiply that angle by the mass of Jupiter, and by the square of a certain line which depends on his internal constitution: the product forms the "rotational" moment of momentum.
"The Story of the Heavens"
Robert Stawell Ball