The figure library — page 3

• The direction of the shaking, and the filter that only asks about it
• The answer that was not there before
• The correlation no instructions can produce
• The angle at which reflection picks a side
• The crystal that answers twice
• The rotation a return trip doubles
• The phase that is only a shape
• The retarder with no crystal in it
• The light with no direction of shaking
• The pattern the sky is written in
• The stress that polarised light can see
• The twist that carries light round a corner
• The grid that stops the light along its wires

Every branch polariser-stack draws, and what checks it

• The same push, further out, and why that is a different quantity
• The mass, and where it sits, which is what decides the race
• Force multiplied, and nothing gained
• The point that keeps moving as if nothing had happened
• The axis that will not hold
• The quantity that survives a change of shape
• The axis a leak of energy chooses
• The wobble that is slow because the Earth gives
• The compass that finds the axis the Earth turns about
• The vibration that turns part of the way
• The disk that spins faster as it stops
• The egg that keeps turning after it is stopped
• The weights that stop a spinning satellite

Every branch rigid-rotation draws, and what checks it

• When two waves meet, they simply add
• Where rays stop being enough, and a shadow acquires a bright centre
• Every front is a source
• What a thousand slits buy that two cannot
• Why two lamps never interfere
• How far a wave can remember
• The spiral that says how much light arrives
• The backward wave Huygens had to remove
• The fan of plane waves inside every beam
• The wiggle faster than any wave in it
• The mirror that sends a wave back to where it began
• The wave that arrives first by going the long way
• The thunder that passes over the listener's head

Every branch two-source-interference draws, and what checks it

• A charge that turns must glow
• The sky that crowds into a cone
• The force a charge exerts on itself
• Whether a charge on a table glows
• The bill that arrives when the pushing stops
• The flash a circling charge sends once a turn
• The cross-section that forgets the colour
• Why the glow of a fast charge is blue
• The light a charge makes by changing medium
• The circling that comes in quanta
• The rainbow a passing electron leaves on a grating
• The radio that only heavier electrons can make

Every branch larmor-radiation draws, and what checks it

• Where rays stop being enough, and a shadow acquires a bright centre
• Everything has a wavelength, and almost nothing shows it
• How far apart two things have to be
• What a thousand slits buy that two cannot
• The image that is a diffraction pattern twice
• The rings that belong to the edge
• How accurate a mirror has to be
• The dark lines a wave cannot avoid
• The half cycle a focus adds
• The spikes a bright star wears
• The beam that does not spread and the price it pays
• The eye a fly cannot afford

Every branch single-slit draws, and what checks it

• The layer a parcel cannot leave
• The wave that picks an angle
• The wave that is required to stand still
• The reflection that changes the wavelength
• The latitude past which a tide cannot split
• The wave that holds a ship back
• The salt that sinks through a stable sea
• The mixture heavier than either water
• The cloud that cools more slowly than the air
• The pond that is hottest at the bottom
• The plume that stops below the surface
• The lake that holds its gas until it does not

Every branch stratified-parcel draws, and what checks it

• How high water will climb
• The angle a liquid makes with what it sits on
• The ring the drop leaves behind
• The column that is pulled, not pushed
• The corner a liquid never stops climbing
• The pore that fills from dry air
• The angle a voltage can set
• The pore that lifts highest fills slowest
• The walls a rinse pulls together
• The cereal that gathers at the edge of the bowl
• The drop that runs to the narrow end

Every branch capillary-rise draws, and what checks it

• Half a kT for every way of moving
• The correction that took a century
• Why heating a perfect spring changes nothing
• The share that is not half a kT
• The entropy that is still there at zero
• Half a kT in a piece of wire
• Weighing what cannot be put on a scale
• The heat that turns into matter
• The heat capacity that goes up and comes down
• The ball that weighs how a gas stores heat
• The note that fixed the kelvin

Every branch heat-capacity draws, and what checks it

• Where every model runs out at once
• The entropy that lives on a surface
• The temperature of an acceleration
• The hole that outlives everything and then does not
• The length no experiment can resolve
• The area that is not allowed to shrink
• The estimate that misses by a hundred and twenty
• The scale that may not be where it looks
• The photons that raced for seven billion years
• The clock that cannot be both light and good
• The nineteen decades a slow coupling buys

Every branch horizon-thermo draws, and what checks it

• The magnet that has to fight its own field
• The magnetism classical physics forbids
• The staircase that never reaches the floor
• Four states, and one of them is odd
• Hotter than any temperature there is
• The curve that is really a staircase
• What holds a magnet together is not magnetism
• The first length that belongs to the substance
• Nothing keeps a magnetisation for ever
• The magnet that reverses where its crystal is weakest
• The hum at twice the mains

Every branch hysteresis-loop draws, and what checks it

• The pendulum, and the small lie that makes it simple
• The period that depends on the swing, computed exactly
• The length nobody has to measure
• The fall that does not depend on what is falling
• The binding energy that has to fall too
• The ellipse a pendulum turns by itself
• The point that takes the blow without a jolt
• The pull that has to equal the pull back
• The antiatom that had to be weighed anyway
• The kick that does not change the beat
• The pendulum that must not grow when it warms

Every branch pendulum-period draws, and what checks it

• Now is a choice of slicing
• The length that depends on when, and is not really about length
• The twin who comes back younger
• The pole that fits and does not fit
• Which came first, and who decides
• The ring where the two beams disagree
• The speed that cannot be measured one way
• How big now is
• The rod that is level for only one observer
• The now a travelling twin can measure
• The wave a row of moving clocks leaves on an instant

Every branch simultaneity draws, and what checks it

• A wave is a shape that travels, and nothing else does
• When two waves meet, they simply add
• The term that made light
• What adding does to the energy
• The one medium that was supposed to add exactly
• The phases that turn a glow into pulses
• The lattice no phase can bend
• The field that turns with nothing turning
• The photograph that keeps the spectrum
• The silence that fits in a tenth of a wavelength
• The pattern two gratings make that neither contains

Every branch superposition draws, and what checks it

• Counting what comes out, and never looking inside
• The shape decides the falloff, and the force law never changes
• How a wave thins out
• The attraction that needs no charge
• The pull that grows on the way down
• The field outside that cannot find the core
• The number of dimensions a planet can orbit in
• The mass that would make Gauss's law leak
• The imbalance of charge that would outweigh gravity
• The current a vacuum will not carry

Every branch falloff-compare draws, and what checks it

• The path that does not change
• The ray that bends without a surface
• The path that takes the longest time
• The channel with no walls
• The taper that matches every note
• The surface that images one point exactly
• The medium that images every point
• The lens with no axis
• The surface every ray is normal to
• The beam that focuses itself

Every branch fermat-path draws, and what checks it

• How much charge a shape will hold, before anything is charged
• Where the energy of a field actually is
• The field the matter takes away
• The angular momentum that is in nothing at all
• The force that lives where the model is not
• The momentum of something that is not moving
• The force read off a surface that touches nothing
• The momentum light carries into glass
• The mass a charge's field gets wrong by a third
• The half a wire always takes

Every branch field-energy draws, and what checks it