Philip Harris Ticker Timer Age 4-5 100 solid equilateral triangles

100 solid equilateral triangles

Pulmonary artery

ensuring a colourful variety that captures children's attention and encourages teamwork and play

shape and space

Philip Harris Ticker Timer Age 4-5 100 solid equilateral triangles"This extremely popular unit has revolutionised experiments because of the quality of the traces it makes, and the reliability of the mechanism ensures that ticker tape experiments are no longer hit and miss. There is no double dotting or smearing, even at high speeds. No pen or carbon discs are required. Friction between tape and ticker timer is kept to a minimum. Excellent results can be expected. The unit comes with a boss head so that it can be