United States or Vanuatu ? Vote for the TOP Country of the Week !


A far better aerial, because it is more highly insulated, can be made by using midget insulators instead of the porcelain insulators described under the caption of A Single Wire Aerial and using a small electrose leading-in insulator instead of the porcelain bushing. This makes a good sending aerial for small sets as well as a good receiving aerial. The Best Aerial that Can Be Made.

It is simply impossible under the circumstances to believe that a lamp so constructed could have been made by Goebel before 1872. Nothing in the evidence warrants such a supposition, and other things show it to be untrue. This lamp has a carbon filament, platinum leading-in wires, a good vacuum, and is well sealed and highly finished.

To hook-up the set connect the leading-in wire to one end of the primary coil, or stator, of the variocoupler and solder a wire to one of the taps that gives the longest wave length you want to receive.

The first thing to do is to find out the length of wire you need by measuring the span between the two points of support; then add a sufficient length for the leading-in wire and enough more to connect your receiving set with the radiator or water pipe. You can use any size of copper or aluminum wire that is not smaller than No. 16 Brown and Sharpe gauge.

Now cut off three or four pieces of wire 15 or 20 feet long and twist and solder each one to one of the aerial wires; then slip them through the hard rubber tubes in the leading-in spreader, bring their free ends together as at C and twist and solder them to a length of wire long enough to reach to your lightning switch or instruments. Making a Good Ground.

The carbon piece is connected to the leading-in wire passing through a glass stem, which is wrapped with several layers of mica. An aluminium tube a is employed as usual for screening. It is so arranged that it reaches very nearly as high as the carbon and only the non-conductor m projects a little above it.

To illustrate the effect of the screen, and the advantage of using it, I have here two bulbs of the same size, with their stems, leading-in wires and incandescent lamp filaments tied to the latter, as nearly alike as possible. The stem of one bulb is provided with an aluminium tube, the stem of the other has none.

"All we've got to do now is to hook up our leading-in wire and ground wire and we'll be all set," said Bob. "I've got a fine big table in my bedroom, and I was thinking that that would be a fine place to mount all our things and keep them together." This was agreeable to all concerned, so they repaired forthwith to Bob's room.

Now connect up all the parts as shown in Figs. 99 and 100, then connect the leading-in wire of the aerial with the lever of the switch; and connect the free end of the tuning coil with the ground. If you have no aerial wire try hooking it up to a rain pipe that is not grounded or the steel frame of an umbrella.

Now if you intend to use the air gap lightning arrester fasten it to the wall of the building outside of your window, and bring the leading-in wire from the aerial to the top binding post of your arrester and keep it clear of everything as shown at B. If your aerial is on the roof and you have to bring the leading-in wire over the cornice or around a corner fix a porcelain knob insulator to the one or the other and fasten the wire to it.