vacua

From Dr. Crookes experiments on very high vacua, we may infer that there is very little loss of heat, except by radiation.

It will be understood that for high vacua, low temperature of cooling water (Ti) is more important than copious supply (Q/W).

Another illustration of the power of cooled charcoal to produce high vacua is afforded by a Crookes radiometer.

Atria regum hominibus plena sunt, amicis vacua—The courts of kings are full of men, empty of friends.

Finally, I thought I would try it because we had got very high vacua and good conditions for it.