Article 4 set out special requirements for active and intelligent materials.
The active material will shrink no matter which direction the magnetic field is placed upon it.
You heard the Cloud describe what could happen if radio- active materials penetrate its screen.
The active material of the negative plates is iron oxide.
Once the active material has fallen out of the plates, it cannot be restored into position by any chemical treatment.
We were looking for active materials and we had them.
No work was ever carried out on active materials for nuclear weapons.
We are fairly sceptical about the active and intelligent materials.
An attempt was made to analyze a fragment of the active material, without success.
Groves approved the test, subject to the active material being recovered.