"Before Roentgen" - Tubes not Designed to Produce X-Rays

Crookes Radiometers Crookes Radiometers

Crookes Railway Tube Crookes Railway Tube

Crookes Tube With Three Anodes Crookes Tube With Three Anodes

Geissler Tubes Geissler Tubes

Heating Effects Tube Heating Effects Tube

Maltese Cross Crookes Tube Maltese Cross Crookes Tube