Engineering topics
Publications and source records attributed to Allen, M. J..
Generator employs up/down counters, digital-to-analog converters, and integrator to determine frequency and time duration of output. Circuit can be used where varying signal must be controlled accurately over long period of time.
In preparation for the various studies planned for assessing visual capabilities and tasks in order to set vision standards for astronauts, the following pieces of equipment have been assembled and tested: a spectacle obstruction measuring device, a biometric glare susceptibility tester, a variable vergence amplitude testing device, an eye movement recorder, a lunar illumination simulation chamber, a night myopia testing apparatus, and retinal adaption measuring devices.
Literature search with abstracts on visual performance standards for selection and retention of astronauts