The book Parks And Park Engineering was written by author Lyle, William Thomas, 1875- Here you can read free online of Parks And Park Engineering book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Parks And Park Engineering a good or bad book?
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Willow Grove Park near Philadelphia is an example. To determine the voltage required for an arc light circuit in series, the rule is to multiply the voltage of each light, which is about 80, by the number of lights. Series wiring is frequently employed in small city squares. 2. Gas. The plain jet does not give sufficient illumina- tion. Lights with mantles give a bright and satisfactory light. Gas can be used to advantage in districts where the price is low, as in the natural-gas belt. Gas main...s should never be laid near trees and shrubbery. Leakage of gas exerts a very harmful effect on vegetable life. 3. Acetylene. This gives a brilliant and satisfactory interior light, but is seldom used in park lighting by reason of the expense. The acetylene gas is piped in wrought-iron pipes. 4. Gasoline. Gasoline lighting is cheap and satisfactory in several respects. The great drawback lies in time con- sumed in igniting the lamps. Each lamp is provided with a mantle, and a torch must be used to vaporize the gasoline.
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