Dust is able to communicate with humans via several methods shown throughout
His Dark Materials and
The Book of Dust, including by use of alethiometers.
Mary Malone is able to construct a computer program that, when paired with a detector, can communicate with Dust by typed questions. Later, Mary uses
I Ching divination, which Lyra confirms to be a method of communicating with Dust.
Alethiometers An alethiometer is a truth-telling device which can answer any question. The word is derived from the Greek words
aletheia (truth) and
metron (measure). In Lyra's world, six alethiometers were constructed. Also known as
symbol readers, alethiometers have a ring of 36 standard symbols, but are all different; some, for example have more elaborate decoration. Over the course of the books, several alethiometers are shown being read, including by
Lyra Belacqua, Hannah Relf, and Fra Pavel. Each symbol on the rim of an alethiometer has several levels of meaning; for example, the anchor can mean steadfastness, hope, the sea, or other interpretations. To phrase a question, three adjustable levers are pointed at symbols, and the reader has to hold the level of meaning for each symbol in their head. A fourth lever, made of an alloy sensitive to Dust, swings around, stopping on different symbols to give an answer, with the number of times it stops at a given symbol indicating the level of meaning intended. In
La Belle Sauvage, it is said that no more alethiometers can be built, as their construction depends on a rare metal being subjected to special treatment, knowledge of which has been lost. Oxford has an alethiometer in its library, which is read by Hannah Relf, various other universities have one, and one is missing. After the Magisterium attempts to steal one, a secret society opposed to their actions is able to obtain it and give it to Relf to use on their behalf. The missing alethiometer is found by Malcolm Polstead in the pack of Gerard Bonneville and given to the Master of Jordan College for safekeeping. In
Northern Lights, it is this alethiometer which is given by the Master to Lyra, who is able to read it intuitively. At that point in the story, only two other alethiometers are known to have survived. == History within the books==