Fig. 59-Sectional View of Modern Concentric Float Auto- 167 169 Fig. 61-Float Chambers Used in Carburetors to Maintain 170 171 172 Fig. 62-Types of Automatic Valves to Admit Auxiliary Air Fig. 63-Automatic Carburetor Used on Holt Tractor Fig. 66-Action of Carburetor Used in Gas Traction 174 175 178 180 Fig. 67-How Injected Kerosene is Ignited by Heat in to Produce Electric Spark in Gas Engine Cylinder 194 195 200 Fig. 70-Oscillating Armature Low Tension Magneto and 202 Fig. 72-Sectional View of Bosch High Tension Magneto, a Complete Current Producer for Four Cylinder Engine Ignition Fig. 73-Typical Four Cylinder Low Tension Ignition. 208 Fig. 74-Simple Ignition System for One Cylinder Engine 209 Fig. 75-Two Cylinder Battery and Coil Ignition System . 210 Fig. 77-Diagram Explaining Action of Four Cylinder 212 214 Fig. 78-Simple Exterior Wiring of Four Cylinder High 215 Fig. 79-Illustration Showing Advance and Retard Positions of K. W. Magneto Breaker Box 216 Fig. 80-Part Sectional View of Water Jacketed Motor 220 Fig. 81-Action of Simple Thermo-Syphon Cooling System Fig. 82-Forced Water Circulation Method of Cooling 222 223 Fig. 83-Sectional View of Hart-Parr Horizontal Power Plant Showing Oil Cooling Method. Folding Plate . 225 Fig. 84-Simple Form of Centrifugal Pump for Circulating Cooling Liquid 226 Fig. 85-Cooling Fan Necessary Unless Large Volume of 227 Fig. 86-Simple Combined Cooler and Water Container 229 230 Fig. 87-Oiling by Gravity Feed Oil Cup 235 Fig. 88-Sectional View of Four Cylinder Engine Showing 237 . 238 Fig. 90-Mechanical Oiler Attached to Motor. Note Leads to Cylinders and Timing Gear Case 239 Fig. 91-Sectional View of Simple Mechanical Lubricator 240 Fig. 92-Sectional View of Motor Showing Complete 242 243 Fig. 94—Side View of I. H. C. Mogul Tractor, Showing Location of Clutch 246 Fig. 95-Sectional View of Simple Clutch, Showing Principal 249 Fig. 96-Sectional View of Master Clutch Used on Holt 251 Fig. 97-Clutch of Avery Tractor is Provided With Three 252 Fig. 98—Clutch of Rumely Tractor Utilizes Three Friction 253 Fig. 99-Side View of Power Plant and Friction Disc 255 Fig. 100-Explaining Action of Heider Double Disc Friction Clutch 257 Fig. 101-Clutch and Transmission Assembly of Ohio 258 Fig. 102-Outlining Action of Ohio Friction Roller Clutch. 260 Fig. 103-Master Clutch and Reversing Mechanism of 262 Fig. 104-Showing Arrangement of Clutches and Drive 264 . Fig. 105-Diagram Showing Action of Speed Changing Gearing 268 Fig. 106-Plan View of Morris Tractor Mechanism, Outlining Arrangement of Engine Crankshaft, Speed Changing Mechanism and Rear Axle 270 Fig. 107-View of Transmission and Differential Unit With 272 Fig. 108-View of Change Speed Gearing of I. H. C. Two 274 Fig. 110-Sliding Gear of I. H. C. Two Speed Transmission in Direct Drive Position 275 Fig. 111-Sectional View of Typical Countershaft With Fig. 112-The Differential Spider With Bevel Pinions and 279 Fig. 113-Countershaft With Differential Spider Outlined at 280 Fig. 114-Frame and Running Gear Assembly of I. H. C. "Mogul" Tractor 284 Fig. 115-Frame Assembly of Typical Gas Tractor, Showing Fig. 115A-Frame of the "Twin City 40" Gas Tractor Built Fig. 116-Rear End of I. H. C. Tractor Frame, Showing 286 287 288 289 Fig. 118-Showing Arrangement of Ackerman Front Axle Fig. 120-Showing Advantages of Large Wheels for Tractor Fig. 121-Tractor Driving Wheel Showing Method of Fig. 122-Tractor Driving Wheel and Hub Casting. Note 292 293 . 295 297 Fig. 123-Traction Wheel of Gas Tractor With Spring Members to Remove Shocks from Driving Gears . 298 Fig. 124-Driving Wheel of Tractor Utilizing Chain Drive Fig. 125-Cross Section of Hart-Parr Rear Hub Showing Fig. 127-Extension Rims Designed to be Attached to 299 300 301 302 Fig. 128-Showing Construction of Caterpillar Tread 303 Fig. 129-Comparison Between Wheel and Caterpillar 305 Fig. 130-Tabular Comparison Between Caterpillar and 306 Fig. 131-Showing Two Methods of Steering Four Wheeled Traction Axle ⚫307 Fig. 132-Front View of I. H. C. "Mogul" Gas Tractor Frame Showing Centrally Pivoted One Piece Axle . 309 Fig. 133-Front View of I. H. C. Tractor Using Ackerman Type Front Axle With Elliot Pattern Steering Knuckles 310 Fig. 134-Front View of Three Wheel Hart-Parr Gas Tractor Frame Utilizing One Wheel for Steering Purposes Fig. 135-Sectional View of Front Wheel of Hart-Parr 312 '. 313 Fig. 136-Outlining Application of Automatic Steering 315 Fig. 136A-The Cuddy Automatic Steering Device Applied to Ackerman Type Front Axle . 316 Fig. 137-Showing Important Members of Conventional 317 Fig. 138-Front View of Hackney Gas Tractor Which Has 319 Fig. 139-Rear View of Holt Caterpillar Tractor Showing 321 323 328 Fig. 143-Governors of the Centrifugal Type Form Important Part of Tractor Power Plant Control System . 329 Fig. 144-Small Engine Used to Start Large Power Plant of I. H. C. "Mogul" Tractor 331 |