Practice of Kinetics (Comprehensive Chemical Kinetics, Volume 1)

~~~~ .-3 APPARATUS 43projected from a small capillary quartz envelope (Fig. 33). Since these lamps operateat very high temperatures, water or forced air cooling is required to preventthe melting of the quartz envelope. This indicates a short life for the lamp. Forwater cooling, distilled water should be used to avoid absorption at shorter wavelengths.Circuits and operating characteristics for m~7rcury lampsSince the voltage drop across all lamps decreases as the current increases, a sufficientlylarge resistance (DC) or reactance (inductance and capacitance, AC) mustbe placed in series with the lamp to produce the stable condition of an increase involtage with increase in current. All circuits should include a voltmeter and anammeter so that readings may be recorded while the lamp is in use, to detect anyTABLE 6ENERGY DISTRIBUTION IN LOW- AND MEDIUM-PRESSUREMERCURY ARCS'Relative energyWaoelength, A Lo w-pressure Medium-pressuremercury arcamercury arcb13,67311,28710,1405770-5790546143584045-40783650-366333413126-3 1323022-3028296728942804275327002652-265525712537248224002380236023202224.........10.140.881 .oo0.390.540.030.600.060.200.040.020.03...0.05100.000.0115.312.640.676.593.077.542.2100.09.349.923.916.66.09.32.14.015.36.016.6e8.67.38.66.08.014.0a Hanovia Lamp Division, Engelhard Industries, Newark, N. J., SC-2537 lamp.Hanovia's Type A, 673 A, 550 W lamp.Reversed radiation.References pp. 104-111~~