Method of Testing Oxygen Regulators

Oxygen regulators are used in aircraft to regulate automatically the flow of oxygen to the pilot from a cylinder at pressures ranging up to 150 atmospheres. The instruments are adjusted to open at an altitude of about 15,000 ft. and thereafter to deliver oxygen at a rate which increases with the altitude. The instruments are tested to determine the rate of flow of oxygen delivered at various altitudes and to detect any mechanical defects which may exist. A method of testing oxygen regulators was desired in which the rate of flow could be determined more accurately than by the test method previously used (reference 1) and by which instruments defective mechanically could be detected. The new method of test fulfills these requirements

Performance Characteristics of Venturi Tubes Used in Aircraft for Operating Air-driven Gyroscopic Instruments

Wind tunnel and flight tests were made to determine the performance characteristics of two designs of commercially available venturi tubes used in airplanes to operate air-driven gyroscopic instruments. Data obtained at sea level may be used to make approximate predictions of performance at higher altitudes. There is some indication that this may also be done for single venturi tubes. For a given installation in which an air-driven instrument is connected through tubing with a venturi tube, the volume rate of induced air flow is approximately proportional to the product of indicated air speed and the square root of the ratio of standard to ambient air pressure. The efficiency of such a system at a given altitude is constant. Rather large variations in suction and efficiency were found for individual tubes of the same design. Cylindrical fairings on the external surface resulted in a reduction of both drag and suction but little change in efficiency

Between stigma and pink positivity: women’s perceptions of social interactions during and after breast cancer treatment

This study explores women’s perceptions of social interaction during and after their treatment for early stage breast cancer. Analysis of interviews with 24 women between 6 months-29 years post-diagnosis, reveals that interactions can be influenced by conflicting public discourses surrounding breast cancer. For example, there is the continuing association of cancer with death and the resulting potential for a stigmatised identity (Goffman, 1963). In contrast is the ultra-positive discourse around cancer survivorship, with breast cancer in particular being associated with pink campaigning and a push towards positive thinking. Participants described ‘managing’ conversations during treatment; sometimes playing down their ‘private’ suffering and presenting a positive (‘public’) image rather than risk alienating support. After treatment they were encouraged to move on and get back to ‘normal’. Whilst other breast cancer patients/survivors were often good sources of support, there was also a danger of assuming that all experiences will be the same. We present data to illustrate that women often present ‘public’ accounts which are driven by an expectation of positivity and fear of stigmatization at all stages of breast cancer treatment and beyond

Cancer diagnosis as discursive capture: Phenomenological repercussions of being positioned within dominant constructions of cancer

This paper is concerned with the phenomenological repercussions of being positioned within widely available discursive constructions of cancer. One of the many challenges of being diagnosed with cancer is that it requires the person to make sense of the diagnosis and to find meaning in their changed circumstances. From a social constructionist point of view, such meaning is made out of discursive resources which are available within one’s culture. This paper critically reviews some of the dominant discourses surrounding cancer which are available within English-speaking Western industrialized cultures. It maps out the discursive positions available to those diagnosed with cancer and it traces some of their implications for how cancer may be experienced and how it may be lived with. As such, this paper is concerned with the social and psychological consequences of being positioned within dominant cancer discourses

NACA Technical Notes

Oxygen regulators are used in aircraft to regulate automatically the flow of oxygen to the pilot from a cylinder at pressures ranging up to 150 atmospheres. The instruments are adjusted to open at an altitude of about 15,000 ft. and thereafter to deliver oxygen at a rate which increases with the altitude. The instruments are tested to determine the rate of flow of oxygen delivered at various altitudes and to detect any mechanical defects which may exist

NACA Technical Notes

"Wind tunnel and flight tests were made to determine the performance characteristics of two designs of commercially available venturi tubes used in airplanes to operate air-driven gyroscopic instruments. Data obtained at sea level may be used to make approximate predictions of performance at higher altitudes. There is some indication that this may also be done for single venturi tubes" (p. 1)

NACA Technical Reports

From Summary: "The report includes a description of the commonly used types and some others, the underlying principle utilized in the design, and some design data. The inherent errors of the instrument, the methods of making laboratory tests, descriptions of the test apparatus, and data in considerable detail in the performance of commonly used instruments are presented. Standard instruments and, in cases where it appears to be of interest, those used as secondary standards are described.