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Book B: 52 Pages]
Oxford Reading Tree Story Sparks is an emotionally-engaging and phonically decodable variety fiction series that is designed to develop comprehension skills
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Philip Harris Electromagnet Age 3-5 Book B: 52 Pages]A powerful electromagnet comprising a 'U' shaped soft iron core 100mm x 65mm overall. Formed from a 16mm diameter bar. The windings are of 0. 9mm enamelled copper wire wound on insulation bobbins, connected in series and provided with 4mm sockets. The ends of the core are carefully ground to provide optimum magnetic contact with the armature, which is also ground flat. Winding resistance is approximately 0. 5 A force of about 75N is required to pull
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