Popular science monthly . wardthrough the central holes, so that itshead drops into the counter-bored spacein the base and its threads project ashort distance above the top. A washerand nut put on the upper end will thenhold the entire framework together. Some No. 10 bare copper wire, orsome stranded bronze tiller-rope oraerial wire, is to be wound spirally onthe insulators. Referring to Fig. 3, theend is first wrapped around the upperfront right-hand insulator A and splicedon itself. Tlie wire is then led straightback to the toji insulator of the backright upright, then across to the topback
Popular science monthly . wardthrough the central holes, so that itshead drops into the counter-bored spacein the base and its threads project ashort distance above the top. A washerand nut put on the upper end will thenhold the entire framework together. Some No. 10 bare copper wire, orsome stranded bronze tiller-rope oraerial wire, is to be wound spirally onthe insulators. Referring to Fig. 3, theend is first wrapped around the upperfront right-hand insulator A and splicedon itself. Tlie wire is then led straightback to the toji insulator of the backright upright, then across to the topback left insulator, as shown by thedotted line, then forward to the topfront left insulator, and then to the ne.\tlower front right porcelain. The windingis continued as shown until the lastinsulator, B, is reached; there the wireis made fast by splicing, as before. Two connected clips must be made orpurchased. The spring testing cli])s soldby electrical su|iply houses are admirablefor tliis, thougli anything of the sort will. A loading coil to make the transmitter meetUic requirements of the federal laws do. I^lexible wires are soldered to eachof them, so that connection to any part olI lie bare wire-spiral may be maile merelyby clipping on the ilesin-jl point. Popular Science Monthly 629 Fig. 6. The Aerial The permit amateur wirelessstations to use any wavelcngtii up to200 meters, provided tiiat the wave sentout is sharp and pure. This means thatthe aerial wire system to be used witht he sendinij appara-tus described mustnot be more than7 5 ft. ! o n p ,measured along theconductor from itstop to the groundconnection. It isa good plan to usetwo wires about50 ft. long runningside by side to thetop of a tree orchimney or special-ly built pole, keep-ing the wires about five feet apart by fastening them at eachend to a light wooden spreader. The top,and in fact the whole aerial, must bethoroughly insulated, if good results areto be secured. An excellent plan forprev
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
