Dec. 6.]

THE NEW ZEALAND GAZETTE.

Heat.—Nature of heat; effects produced; temperature; quantity;
specific heat; latent heat; vaporization; mechanical equivalent; com-
bustion ; calorific value of a fuel.

Transmission of Heat.—Radiation; conduction; convection; practical
examples.

Behaviour of Gases.—Elementary consideration of relative changes in
such properties as volume, pressure, temperature; internal energy;
common values of compression ratios in engines.

Principles of Operation of Two- and Four-cycle Engines.—Reasons for the
positions of opening and closing of valves ; principles underlying the con-
struction and function of each detail of a typical engine.

Balancing of Engines.—Consideration of arrangements of cylinders and
cranks, and firing-order in two- four- and six-cylinder engines, with reference
to torque and balance.

Valve Mechanism.—Types of cams and tappets; lift of valves; effective
opening; valve timing diagrams for high- and slow-speed engines; effect
of steam-leakage; weak springs; jammed valves; setting valves.

Carburation.—General principle of action of a carburettor, and description
of forms in common use; methods employed to supply a constant-quality
mixture; importance of supplying heat to the mixture; methods of
supplying heat; common faults and their correction.

Fuel-supply Systems.—The location and correction of faults; gravity
and vacuum systems.

Cooling-systems.—Air, thermo-siphon, and pump systems; types of
radiators; fans; arrangement of passages for liquid; causes of overheating.

Lubricating - systems. — Splash, force-feed, and dry-sump systems;
accessories; indicators; pumps, &c.; location of faults and their correction.

Clutches.—Construction of various types; methods of operating and
adjustment.

Change-speed Systems.—Necessity for construction and operation of
selective three- and four-speed gear-boxes. Epicyclic systems.

Transmission of Power to Back Axle.— Shafts and universal joints.

Back-axle Assembly.—Principles of various types of constructions;
differentials; final drives; live and floating axles; adjustments.

Brake-construction.—Linkages; equalizers, internal and external types;
transmission and back-wheel brakes; front-wheel brakes; adjustments
and repairs.

Principle of Chassis-construction.—Systems of springing; methods of
drive, and torque reactions; variation of torque and braking effect; engine
suspension.

Front-axle Assembly.—Setting of front axle and wheels; Ackerman
principle; practical adjustments.

Steering-gear.—Adjustment and principle of worm and sector; split
nut; screw, variable ratio; Marles and Ross systems.

Electrical.—Sufficient idea of principles to locate common faults in
battery and magneto ignition systems; setting and adjustment of H.T.
inductor and rotary armature magnetos; care and adjustment of points
and symptoms of common faults in battery and magneto systems; changing
from magneto to battery and vice versa; timing ignition; Ford system.

Batteries.—Testing condition, and maintenance of batteries.

Wiring-circuits.—Diagrams of simple lighting, starting, and ignition
circuits; location and remedy of simple faults in wiring-systems.

4. Workshop Practice.

Filing to a reasonable degree of accuracy and a certain amount of
chipping; marking out, drilling, and reaming; use and care of dies and
taps; brazing, riveting, and soldering; making and tempering of hand-
cutting tools; sharpening drills; lathe-work, turning, boring, setting up,
&c., elementary blacksmithing, also bending and annealing of copper pipes.

SYLLABUS OF COURSE FOR THE FINAL EXAMINATION FOR MOTOR MECHANICS.

1. Theoretical and Practical Course.

For the final examination a candidate will require a more thorough
knowledge of the subject-matter outlined for the intermediate examination,
and in addition a knowledge of the following :—

Liquid Fuels.—Properties of heavy oils, petrol, paraffin, alcohol, benzol,
and conditions under which they may be employed.

Carburation.—Effect of petrol-air ratios on running, efficiency, and exhaust
products; importance of manifold constructions; turbulence and causes
of detonation.

Carburettors.—Adjustment of standard types for best performance;
details of construction; principle of compensation, and constant mixture.

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