CHAPTER XIII. 131. Cantilever and Stiffened Suspension Bridges 166 132. Cantilever Bridges 166 133. Stiffened Suspension Bridges 168 134. The Stiffening Truss 170 135. Location and Arrangement of Stiffening Trusses 171 136. Division of Load between Cables and Stiffening Truss 173 137. Stresses in Cables and Moments and Shears in Trusses 174 138. Thermal Stresses and Moments in Stiffened Suspension Bridges 175 139. Formation of the Cables 176 140. Economical Limits of Spans 177 PART III. _WATER-WORKS FOR CITIES AND TOWNS._ CHAPTER XIV. 141. Introductory 179 142. First Steam-pumps 180 143. Water-supply of Paris and London 181 144. Early Water-pipes 181 145. Earliest Water-supplies in the United States 182 146. Quality and Uses of Public Water-supply 182 147. Amount of Public Water-supply 183 148. Increase of Daily Consumption and the Division of that Consumption 183 149. Waste of Public Water 186 150. Analysis of Reasonable Daily Supply per Head of Population 188 151. Actual Daily Consumption in Cities of the United States 189 152. Actual Daily Consumption in Foreign Cities 191 153. Variations in Rate of Daily Consumption 192 154. Supply of Fire-streams 193