Fig. 145-Rear View, of I. H. C. Tractor Showing Control
Levers and Operator's Platform

333

Fig. 146-Control Levers and Starting Crank of "Twin
City 40" Gas Tractor

335

Fig. 147-Control System of Holt Caterpillar Tractor
Showing Important Elements

338

Fig. 148-Operator's Cab of Pioneer Gas Tractor With
Important Parts of Control System Indicated
Fig. 149-Plan View of Combined Tractor House and
Farm Machine Repair Shop

339

Fig. 150-Plan View Outlining Suggested General Arrangement of Tractor House With Repair Shop and Workroom

.

345

347

Fig. 150A-Interior View of Household Workroom in Which
Shafting May be Run from Tractor Housed Alongside 350
Fig. 151-Front Elevation of Tractor House With Repair
Shop, Workroom and Circular Saw Shed
Fig. 152-Arrangement of Parts of Approved and Con-
venient Fuel Storage System for Tractor House
Fig. 152A-A Simple Home-made Underground Gasoline
Storage System That is Economical and Easy to
Make

351

355

356

Fig. 152B-Bowser Underground Fuel Storage System for
Automobiles or Tractors

358

Fig. 153-Tools That Will be Found Useful in Working
Around Tractor Mechanism

361

Fig. 154-Blacksmith Shop Equipment That Will be
Found Useful in General Farm Work as Well as Tractor
Repairing

363

364

Fig. 155-Complete Set of Carpenter's Tools a Useful Ad-
dition to Farm Repair Shop Equipment .
Fig. 156-Power Plant of Phoenix Tractor Showing Water
Pump, Governor Assembly and Ignition Magneto 367
Fig. 157-Valve Side of Phoenix Four Cylinder Tractor
Motor Showing Crankcase Inspection Plates, Inlet and
Exhaust Manifolds and Carburetor

368

Fig. 158-Side View of Bates Gas Tractor Showing Accessibility of Power Plant When Automobile Type Motor Hood is Raised

369

Fig. 158A-Showing Accessibility of Power Plant on Holt
Caterpillar Tractor

370

Fig. 159-Power Plant of "Twin City 25" Gas Tractor
Showing Accessibility of Auxiliary Parts, Valves and
Valve Springs and Crankcase Interior Inspection
Plates

Fig. 160 Showing How a Piston of Gas Traction "Big Four"
Engine May be Removed from Cylinder to Inspect
Rings and Remove Carbon Deposits from Piston
Top

372

373

Fig. 161-How Valve Spring and Valve May be Removed
From Gas Tractor Engine Cylinder

377

Fig. 162-Method of Using Bit Brace and Screwdriver
Bit in Grinding Valves

378

Fig. 163-Bottom View of Crankcase With Bottom Half
Removed to Expose Crankshaft and Main Bearings
Fig. 164-Connecting Rod of Gas Tractor Power Plant
Showing Removable Crankpin Brasses .

Fig. 165-Tools That Facilitate Refitting of Bearings
Fig. 166-Method of Testing Capacity of Dry Cell
Fig. 167-Assembly View of Reversing Gear, Main Drive
and Differential Gearing of "Twin City 40" Gas
Tractor.

385

386

. 387

392

395

398

Fig. 168-Driving Gears of "Twin City 25" Gas Tractor
Fig. 169-I. H. C. Gas Tractor Pulls Eight Bottom Hand
Lift Gang Plough With Ease. A Simple Hitch of
Marked Utility

Fig. 170-These Three Gas Tractors Are Doing the Work
of 120 Horses and but Three Men Are Needed to
Guide Them

400

402

Fig. 171-Holt Caterpillar Tractor at Work Ploughing
Deep Furrows

403

Fig. 172-Typical Hand Lift Five Bottom Gang Plough
Adapted for Use With Traction Engine.
Fig. 173-Avery "Self Lift" Ten Bottom Gang Plough
Makes It Possible for Engineers to Control Ploughs
Without Leaving Tractor Cab .

404

404

Fig. 174-View Showing Mechanism of Avery "Self Lift
Plough.

405

Fig. 175-Plan Views of Combination Hitches That Save
Time and Labor. A-Plough, Packer and Toothed
Harrow. B-Plough, Packer, Drill and Toothed
Harrows

. 406

407

Fig. 176-Ploughing, Packing, Harrowing and Seeding
This Ground Accomplished in One Operation. "Twin
City 40" Gas Tractor Furnishes Power When Utilized
in This Manner at Extremely Low Cost .
Fig. 177-Outfit of Berland & Lee, Brady, Mont., Plough-
ing With Disc Plough and Packing With Stone Drag 408
Fig. 178-Simple Three Drill Hitch Easily Made by Any
Farmer

Fig. 179-Wrought Iron Pipe Drill Hitch for Three Drills
Fig. 180-Practical Application of Drill Hitch
Fig. 181-Hansmann Patent Five Drill Hitch Very Useful
in Seeding Large Areas as It Covers a Strip Sixty Feet
Wide

Fig. 182-Avery Gas Tractor Outfit Owned by D. M.
Circle, Kiowa, Kansas, Pulling a Double Disc and
Lever Tooth Harrow

409

409

410

410

411

.

Fig. 183-Details of Easily Constructed Harrow Hitch for
Four Ten Foot Disc Harrows .

412

Fig. 184-Practical Application of I. H. C. "Mogul"

Tractor in Road Grading Work

412

Fig. 185-Avery Gas Tractor Pulling Western Wagon Loader
and Elevator Grader
Fig. 186-Practical Hitch for Pulling Three Road Scrapers
Simultaneously

413

415

Fig. 187-Special Wagon Adapted to be Used in Train
Hauled by Gas Tractor

Fig. 188-Combination Road Roller and Tractor, an
Extremely Useful Machine for General Contractors or
Municipal Use. A-Machine With Roller for Steering
and Auxiliary Rims on Traction Members. B-
Roller Removed from Front and Wheels Substituted,
Making Practical Tractor for Road or Field Work
Fig. 189-Harvesting With Avery Gas Tractor in North

416

417

418

419

Fig. 190—I. H. C. Gas Tractor Pulling Three McCormick
Harvesters

Fig. 191-The Threshing Outfit Entrained Ready for
Trip to Destination in Upper View. Outfit at Work
in Field in Lower View

Fig. 192-Gas Tractor Not Only Cuts but Stores the
Fodder.

421

422

Fig. 193-Holt Caterpillar Tractor Demonstrates Its Worth

In Swampy Ground

424

Fig 194-The Modern Gas Tractor Makes Hauling of
Heavy Logs a Commercial Proposition.
Fig. 195-An Aultman & Taylor Tractor Operating in Deep
Snow, Shows That All the Year Round Service May be
Obtained from the Modern Gas Tractor
Fig. 196-Ingenious Home-made Light Tractor Saw
Constructed by F. J. Jantz of Hilsboro, Kansas
Fig. 197-Home-made Gas Tractor Outfit Built by John H.
Sands, Cavalier, North Dakota

425

426

427

428

Fig. 198-Method of Installing Auto-tractor Under Rear Axle of Car and General Construction of the Attachment Outlined

429

Fig. 199-Side View of Automobile, Equipped With Autotractor Attachment

431

Fig. 200-Rear View of Automobile With Auto-tractor Attachment, Showing Practical Application in Ploughing.

434

Fig. 201-The Common Sense Gas Tractor is Built Very Much on the Lines of an Automobile

439

Fig. 202-The Gray Tractor Utilizes Special Drum Traction
Member

Fig. 203—Traction Drum of Gray Tractor at A and Method of Absorbing Chain Drive Shocks by Coil Buffer Spring shown at B

440

442

Fig. 204-The Bates Steel Mule Tractor Attaches to All Farming
Implements Just as Animals are and is Really a Mechani-
cal Horse. This is a Distinctive Design
Fig. 205-Hart-Parr Little Devil Tractor is a Typical Medium
Weight, Three-Wheel Type

443

444

Fig. 206-Skeleton Type of Drive Wheel Used on Hart-Parr "Little Devil" Oil Tractor

445

Fig. 207-Sectional View of Two-stroke Cycle Oil Engine Used

on Hart-Parr Three-wheel Tractor Showing Method of Fuel
Supply

446

Fig. 208-Sectional View of Water Spray Portion of Hart-Parr
Oil Engine Carburetor

Fig. 209-The Universal Motor Cultivator with One of the
Many Possible Attachments that can be Used with it

448

Fig. 210-The Beeman Garden Tractor and Walking Engine
is Ideal for Small Farms

Fig. 211-The Bennett Dust Filter for Removing Grit from Air
Drawn in the Engine through the Carburetor
Fig. 212-Types of Anti-friction Bearings that are Meeting
Favor of Tractor Designers

Fig. 213-Specifications Galloway's "Farmobile"

Fig. 214-Specifications Rumley "All Purpose
Fig. 215-Specifications Wallis Cub

Fig. 216-Specifications Big Bull Tractor

Fig. 217-Specifications Standard Detroit

Fig. 219-Specifications Case "25" Tractor

Fig. 220-Specifications Emerson Farm Tractor

449

451

452

455

456

457

458

459

. 460

461

462

Fig. 221-Avery 5-10 Tractor

Fig. 223-Side View of Tom Thumb Tractor with Hood Sides
Removed to Show Arrangement of Power Plant Parts and
Other Mechanism

Fig. 224 Specifications Tom Thumb Tractor
Fig. 225-Plan of Easily Constructed Prony Brake for Making
Power Tests

Fig. 226-A Simple Method of Determining Grade Percentages without a Gradometer

475

Fig. 227-Road Signs of American Motor League that Give
Warnings of Interest to Tractor Operators or Motorists
Fig. 228-Belt-Driven Centrifugal Pump Suitable for Irrigation
Purposes May be Driven by Direct Connection with Belt
Pulley of Gas Tractor Power Plant.

478

489