This Classical period saw the annexation of much of modern-day Greece by the Persian Empire, its subsequent independence, and it also had a powerful influence on the Roman Empire and greatly influenced the foundations of western civilization.his Classical period saw the annexation of much of modern-day Greece by the Persian Empire, its subsequent independence, and it also had a powerful influence on the Roman Empire and greatly influenced the foundations of western civilization.
Dwyer Series A3000 PhotohelicÂ® Pressure Switch/Gauge. PhotohelicÂ® Switch/Gages function as versatile, highly repeatable pressure switches combined with a precise pressure gage employing the time-proven Magnehelic Â® gage design. The PhotohelicÂ® gage measures and controls positive, negative or differential pressures of air and compatible gases. Standard models are rated to 25 psig (1.7 bar) with options to 35 (2.4) or 80 (5.5 bar) psig. Single pressure 36000S models measure to 6000 psig (413 bar) with a 9000 psig (620 bar) rating.
Overview. 1  A cold cathode fluorescent lamp (CCFL) is a lighting system that uses two phenomena: electron discharge and fluorescence. 2  Fluorescent lamps and cold cathode fluorescent lamps have extremely similar constructions, but they use different types of electron discharge.