. Practical wireless telegraphy; a complete text book for students of radio communication . will preventcopper dust imbedding in the carbon, which causes excessive wear on thecommutator.) (3) Go over the transmitting apparatus with a slightly oiled rag at least twiceper week to prevent the accumulation of moisture on the insulating this oftener if the moisture or humidity is excessive. (4) Keep all switch contacts well polished and switch blades thoroughlytightened. (5) Go over the nuts and bolts of the panel sets with a small spannef wrenchfrom time to time (they loosen by vibration)
. Practical wireless telegraphy; a complete text book for students of radio communication . will preventcopper dust imbedding in the carbon, which causes excessive wear on thecommutator.) (3) Go over the transmitting apparatus with a slightly oiled rag at least twiceper week to prevent the accumulation of moisture on the insulating this oftener if the moisture or humidity is excessive. (4) Keep all switch contacts well polished and switch blades thoroughlytightened. (5) Go over the nuts and bolts of the panel sets with a small spannef wrenchfrom time to time (they loosen by vibration). (6) Keep the aerial wires taut and take up all side sway. (7) Inspect the aerial from time to tune to insure that it does not swing intocontact with some nearby conductor. (8) Keep the storage batteries fully charged at all times. (9) Keep the plates of the cells covered with water at least one-fourth of an inch.(10) Inspect the connections between cells frequently. 242. Makeshift Testing Apparatus.!—A convenient and practical trouble finding apparatus is the simple incan- 110 VOLTS. Fig. 324—Simple Test Lamp Circuit for Determining anOpen Circuit in a Coil. descent lamp which may be used tolocate open circuits or short-circuits incertain types of electrical lamp, if connected as in Fig. 324 toa source of 110 volts will light tofull brilliancy if the circuit is closed atA, B, through some device which is notof too high resistance. If the resistance of the coil of wireL, for example, does not exceed, say, SOohms, the lamp will light to a fair degreeof brilliancy if the circuit is continuous,but, obviously, if the coil is broken atany point the lamp will not light, andan open circuit will therefore be indi-cated. It is easily seen from this simpleproblem alone, that the would-be trouble finder must have some knowledge of the electrical constants of the circuit with which he deals in order that he may apply the proper testing illustrate, if th
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
