{"gt_parse": {"text_sequence": "tating rod is then draw n upwards very slo wly—at about 2 5 mm per hour when making a crystal of ruby —allowi ng a rough ly cylin drica l bo ule to be fo rme d. T he b ou le c an be fro m o ne to two metres depending on the amount of silicon in th e crucible.The electrical characteristics of th e silicon are controlled by addi ng material like phosphorus or boron to t"}}