e suitably counterweighted.

Working the Plant.--When starting up the plant, leave the burner open
until inflammable gas issues, so that the air present in the various
chambers may be displaced.

[Transcribers note: Premature lighting of the burner may cause the flame to
propagate into the system and explode. I speak from experience.]

INDEX.

Aeroplane, model, self-launching.
Bedplate for engine.
Bellows, double.
Bench, joiner's.
Benham's harmonograph.
Bicycle shed.
Boilers, model.
Bookstand.
Box kites.

Cabinets, cardboard, cigar-box, match-box, tool.
Circles, rolling.
Clock, electric alarm.
Colour top.
Cylinder, double-acting steam.

Developing sink.
Doors for shed.
Double-acting horizontal steam engine.
Double bellows.

Eccentrics.
Electric alarm clock.
Electric motor, reciprocating.
Electric railway.
Engine, hot-air.
Experiments, apparatus for simple scientific.

Fuels for model boilers.

Gasworks, miniature.
Ganges, rain, water,
Gimbals, or universal joints.
Gliders, paper.
Goold's harmonograph.
Governor for engine.

Harmonographs.
Hot-air engines.
House ladder.

Joiner's bench.

Kettles, quick-boiling.
Kites, box.
Kite winders.

Ladder, house.
Lamp, signalling.
Locomotive, electric.
Lung-testing apparatus.
Magic swingers.
windmill.
Match-boarding.
Match-box, self-supplying.
Morse code.
Morse sounder.
Motor, electric.
Motor, water.

Nozzle for steam turbine.

Pantograph.
Pendulums for harmonograph.
Pens for harmonograph.
Pneumatic puzzle.
Poultry house.
Propellers for aeroplane.
Pumps.
Puppets, wrestling.
Puzzle, pneumatic.

Railway, electric.
Rain gauges.
Reciprocating steam engine, simple.
Resistance, adjustable, for electric railway.
Reversing switch for electric railway.
Riveting.

Safety Valves.
Sawing trestle.
Shed for bicycle.
Signalling lamp.
Silhouette drawing machine.
Simple scientific experiments.
Sink, developing.
Slide valve.
Smoke-ring apparatus.
Soldering.
Spokes, magic.
Steam cocks.
Steam engines.
Steam gauge.
Steam pump.
Steam tops.
Steam turbines.
Strength. testing machines.
Swingers, magic.
Switch, multiple battery.
Switch, reversing.

Target apparatus.
Telegraphic apparatus.
Testing boilers.
Tool cabinet.
Top, colour.
Tops, steam.
Track for model railway.
Trestle, sawing.
Turbines, model steam.

Vanishing spiral.
Vice for Joiner's bench.

Water gauge.
Water motor.
Weights for harmonograph pendulums.
Win