[of The Ether] It Is No Greater

Heavier-than-air Flying Machines Are Impossible.

I Can Never Satisfy Myself Until I Can Make A Mechanical Model Of A Thing. If I Can Make A Mechanical Model, I Can Understand It. As Long As I Cannot Make A Mechanical Model All The Way Through I Cannot Understand.

Can You Measure It? Can You Express It In Figures? Can You Make A Model Of It? If Not, Your Theory Is Apt To Be Based More Upon Imagination Than Upon Knowledge.

If You Can Not Measure It, You Can Not Improve It.

[of The Ether] It Is No Greater Mystery At All Events Than The Shoemakers' Wax.