Bomb 3 : A tick-walled container, usually made of steel, that is used to receive samples of oil or gas under pressure or to measure and record the pressure at a point in the well. (See: Bottom Hole Pressure.) (WLOP)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}