ABSTRACT
If you’ve already made a hologram at some time, or if you have an experienced friend to help, you may find you can skip much of the earlier part of this chapter. But if you are working on your own, with no previous experience, you should follow the instructions carefully, at least until you have acquired some confidence. There’s nothing more frustrating than to find, after an hour’s work, that you have no image at all. And that’s what happens in holography when something goes wrong. You don’t get just a blurred or feeble image, as in photography. You don’t get an image at all: you have a ‘nullogram’. And finding out what went wrong when you have a failed hologram can be a good deal less easy than finding out the cause of a dud photographic negative or print. But don’t be deterred.
