Why a Notebook Beats Memory

Anyone who has spent a few seasons dowsing in West Wales learns the same lesson the hard way. A place can feel extraordinary on a wet Tuesday in February — the rods swing hard, the air goes oddly thick and still, you come away certain you have found something — and six months later you cannot remember whether that hollow was above Cardigan or below Llandovery. Memory is generous and unreliable in equal measure. It smooths rough detail into a good story.

A notebook does the opposite. It fixes the day, the weather, the exact spot and the exact sensation, so that when you return in a different season you are comparing like with like. It also protects you from your own enthusiasm. Once you have thirty or forty entries, patterns start to show themselves: the same geology producing the same response, the same stillness appearing at the same sort of boundary, and — just as usefully — a few memorable sites that turn out to have been nothing much at all.

What to Carry Before You Leave the House

Keep the kit simple and waterproof. West Wales will test anything that isn't.

• A small pocket notebook with a water-resistant cover, or a hardbacked field book that will take a pencil in the rain.
• A pencil rather than a pen. Ink runs in damp, and pencil writes on wet paper.
• A 1:25,000 Ordnance Survey Explorer map of the area, plus a compass and a clear plastic romer for reading grid references.
• Your rods or pendulum, and a short length of string or a few small stones to mark a spot you want to find again.
• A phone for photographs, but treat the camera as a supplement, never a substitute. A photograph will not remember what your hands felt like.

If you dowse with a companion, agree before you set out that you will each record separately and compare afterwards. Shared notebooks quietly converge on a single version of events, which defeats the purpose.

Nailing Down the Grid Reference

Every entry needs a location precise enough for someone else to stand on the same patch of ground. A six-figure grid reference is usually enough: SN 123 456 puts you within a hundred metres. If a feature is small — a springhead, a gap in a hedge, a single standing stone — add a note such as "eight paces north-east of the gate, on the field side of the thorn". Descriptions that use landmarks survive even when your map-reading is rushed.

Note the altitude if you can, the aspect (which way the slope faces) and the immediate ground: peat, silt, shale, blown sand, glacial till. Record whether you are near a stream, a spring, a well, a boundary dyke, a drovers' road, or an old chapel. These details matter enormously later, because so much of what we feel in the landscape is bound up with water moving underground and with the way people have used the ground for centuries. A note saying "damp hollow, rushes, old wall on the north side" will tell you more in two years' time than a paragraph about tingling.

Sketching What the Rods and Your Body Tell You

Draw as well as write. A quick plan sketch — the field boundary, the stream, the gate, an arrow for north — takes thirty seconds and is worth a page of prose. Mark the places where your rods crossed with an X, and sketch the angle they turned through. A slow, wide swing is a different event from a sharp snap, and the difference is almost impossible to describe but easy to draw.

• Use a simple key at the top of each sketch: a cross for a strong reaction, a circle for a mild one, a dotted line for a reaction you followed across ground.
• Note the direction you were walking and the direction the reaction came from.
• Record anything your body did: a tightening in the chest, a sudden chill, a change in balance, an odd reluctance to step forward.
• Mark the time. Several dowsers find that early morning and the hour before dusk give the cleanest readings, while the middle of a warm afternoon can go vague.

Describing Stillness in Plain Words

The most valuable entries are the ones about atmosphere, and the hardest to write honestly. Resist the temptation to reach for grand language. "The wind dropped completely about twenty paces in, and the birdsong stopped" is precise and useful. "A powerful vortex of ancient energy" tells you nothing you can check.

Ask yourself the same short questions each time, and answer them in a line or two: Was it quiet, or actually still? Did sound behave strangely — footsteps loud, voices flat, a stream suddenly inaudible? Did the air feel cooler or heavier? How did you feel leaving the spot, and how long did the effect last? Note the wind direction and strength, the cloud, and whether it had rained recently. Weather changes how a place reads, and you will want to know whether the stillness you found in October was there again in May.

Reading Your Notes Back Months Later

Set aside an evening now and then to go through the book with a map and a geological survey beside you. Look for clusters: several entries within a few hundred metres of one another, all mentioning a boundary or a spring. Look for the entries that stand alone and unexplained — those are your return visits. Add a second note in the margin in a different pencil, dated, saying what you found when you went back.

Over a year or two, the notebook becomes something better than a list of sensations. It becomes a personal map of West Wales, drawn in your own hand, showing the hollows that go quiet, the ridges that hum, and the ordinary fields that do neither. That record is yours alone, and no one else can make it for you.