Direct thrust measurements of a permanent magnet helicon double layer thruster have been made using a pendulum thrust balance and a high sensitivity laser displacement sensor. At the low pressures used ͑0.08 Pa͒ an ion beam is detected downstream of the thruster exit, and a maximum thrust force of about 3 mN is measured for argon with an rf input power of about 700 W. The measured thrust is proportional to the upstream plasma density and is in good agreement with the theoretical thrust based on the maximum upstream electron pressure.

Lung cancer patients presenting to the ED with dyspnea have much shorter survival than patients with other malignancies. For some patients, the presence of dyspnea requiring emergency treatment may indicate a phase in their illness in which resources should be shifted from acute intervention with hospitalization to palliative and supportive care measures.

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Fifty patients with eosinophilic granuloma of bone were reviewed. Thirty-one lesions were in the head and neck, 24 in the extremities, seven in the pelvis, and five in the ribs. The lesions were lytic with ill-defined margins, endosteal erosion, and solid periosteal reaction. The diagnoses were obtained by surgical biopsy in 36 patients and by percutaneous biopsy in 14. Twenty-six lesions were treated with radiotherapy, 14 by surgery, and nine by surgery and radiotherapy. The last 14 cases have been treated by percutaneous injection of methylprednisolone sodium succinate into the lesion. Healing was obtained in every lesion. There were no complications.

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