Heated metal filaments under electric fields and low pressures of alkali metal gas eject electrons by thermionic emission as a function of the pressure of the gas and the temperature of the filament. To explore this process in a program to develop large-area alkali metal photocathodes. we have designed and built a gauge following the studies of Taylor and Langmuir. We present proof-of... https://darthomes.shop/product-category/garden/