CHAPTER X.

118. X-rays Begin before Striæ End. EDISON and THOMSON, E.

119. Reason why Thin Walls are Better than EDISON Thick.

120. To Prevent Puncture of Discharge Tube EDISON by Spark.

121. Variation of Vacuum by Discharge and by EDISON Rest.

122. External Electrodes Cause Discharge EDISON through a Higher Vacuum than Internal.

123. Profuse Invisible Deposit from Aluminum EDISON and Cathode. MILLER

124. Possible Application of X-rays. EDISON and Fluorescent Lamp. FERRANTI

124_a_. Greater (?) Emission of X-rays by PILTCHIKOFF Easily Phosphorescent Materials.

125. Electrodes of Carborundum. EDISON

126. Chemical Decomposition of the Glass of EDISON the Discharge Tube Detected by the Spectroscope.

127. Sciagraphs. Duration of Exposure EDISON Dependent upon Distances.

128. Differences between X-rays and Light EDISON, FROST, Illustrated by Different Photographic CHAPPIN, Plates. Times of Exposure. IMBERT, BERTIN-SANS, and MESLIN

128_a_. GEORGES MESLINS INSURED A REDUCTION OF TIME FOR TAKING SCIAGRAPHS BY THE DEFLECTION OF THE CATHODE RAYS BY MEANS OF A MAGNETIC FIELD

129. Size of Discharge Tube to Employ for EDISON Given Apparatus.

130. Preventing Puncture at the EDISON Phosphorescent Spot.

131. Instruction Regarding the Electrical EDISON and Apparatus. PUPIN

132. Salts Fluorescent by X-rays. 1800 EDISON Chemicals Tested.

133. X-rays Apparently Passed around a EDISON, ELIHU Corner. Theoretical Consideration by THOMSON, Himself and Others. ANTHONY, _et al._

134. Permeability of Different Substances to EDISON and X-rays. A List of a Variety of TERRY Materials.

134_a_. Illustration of Penetrating Power of HODGES Light.

135. Penetrating Power of X-rays Increased EDISON by Reduction of Temperature. Tube Immersed in Oil, and the Oil Vessel in Ice. X-rays Transmitted through Steel 1/8 in. Thick.

136. X-rays Not Obtainable from Other EDISON, ROWLAND, Sources than Discharge Tube. _et al._