Most of these pictures, taken while travelling, were developed on the mantelpiece of a hotel room, which proves that the method is easy enough to carry out.

The plate at each point only sends back to the eye the simple colour imprinted. The other colours are destroyed by interference. The eye thus perceives at each point the constituent colour of the image.

The problem of direct colour photography has been facing us since the turn of the last century.

The series of photographic operations, developing, washing, final drying, takes about quarter of an hour.

In the case of composite colour, an infinity of systems must be obtained for maxima infinitely slight and with an infinity of interval values separating them - that is to say, the whole thickness of the sensitive layer is occupied in continuous manner by these maxima.

During exposure, interference takes place between the incident rays and those reflected by the mirror, with the formation of interference fringes half a wavelength distant from each other.

The length of exposure (one minute in sunlight) is still too long for the portrait. It was fifteen minutes when I first began my work. Progress may continue.

When the shot is afterwards subjected to white light, colour appears because of selective reflection.

Most of these pictures, taken while travelling, were developed on the mantelpiece of a hotel room, which proves that the method is easy enough to carry out.

I got quite good results from protein plates.

This result is due to a phenomenon of interference which occurs within the sensitive layer.

Life is short and progress is slow.

America is big enough to admit when it's wrong and confident enough to learn from its mistakes.

Wealth and children are the adornment of life.

I had no idea how to eat sensibly.

With these men and women who work-for the cause with all their hearts, with cool heads and skilled hands we will master every fate.

If you watch the news, you see politicians use human vulnerabilities to get in and earn people's trust.

Kids can learn a lot by seeing things rather than reading it.

A lot of the traditional sitcom stuff I did - I think I could have gone that route when I was younger as a staff writer, and I just didn't want to.

In 2000, just before leaving the White House, Clinton ratcheted up military aid to Colombia. Plan Colombia, as the assistance program was called, provided billions of dollars to what was, and remains, the most repressive government in the hemisphere.

You can't buy happiness, but you can buy nail polish and that's kind the same thing.

If there is an audience out there for me, I want them to be surprised when the next book comes out.

You have to give yourself credit, not too much because that would be bragging.

Don't feel sad over someone who gave up on you, feel sorry for them because they gave up on someone who would have never given up on them.

I make a lot of money, but I don't want to talk about that.

Love is the voice under all silences the hope which has no opposite in fear the strength so strong mere force is feebleness the truth more first than sun more last than star.

Ultimately, the reason we have a Constitution, the reason we have separation of powers, the reason we have the Fourteenth Amendment is to provide the courts with the opportunity to override the will of the people when the will of the people discriminates against a segment of our society.

If Christianity is not scientific, and Science is not of God, then there is no invariable law, and truth becomes an accident.

I'm not a dictator. It's just that I have a grumpy face.

I told my mom I would graduate. I owe that much to her and myself.

I collect books - a lot of books.

They say Rome wasn't built in a day, but I wasn't on that particular job.

It is of the essence of traditions that they cover or conceal their humble foundations by erecting impressive edifices on them.

A lot of people try to paint this child actor stigma, but I always looked at it as a great opportunity.

Wind and other clean, renewable energy will help end our reliance on fossil fuels and combat the severe threat that climate change poses to humans and wildlife alike.

The five essential entrepreneurial skills for success are concentration discrimination organization innovation and communication.