… spectroscopes), lasers generally also incorporate certain auxiliary components (e.g., a power supply unit, a cooling … fitted with a pump for the dye solutions). Some of these auxiliary components may be contained in the same housing as …
… are generally of carbon or tungsten. Some lamps have an automatic device to bring the electrodes close together in … with iron filaments in hydrogen ( heading 85.33 ). (c) Automatic thermo‑electric switches (starters) for starting …
