what's behind the bright lights of the sky sign here is the biggest one of them all let's take it apart and see what makes it slick a regular forest of gold enough steel for a skyscraper that's what it is twenty three stories high by day this sparkling giant of the night needs a lot of care one of those things up there flies no sir they're the men behind the bright lights monkeys who scramble about this guy off of that as easy as a b c there are hard working crew who shinny up and down a lot of groups to be sure that every one of these millions of lights will keep on duty through the night you have to know your ropes to get anywhere in this contraption a post in chariots called and it's just like those the sailors use when the repair of the rigging on a boat if your feet don't get mixed up in starting your ok oh there is a knack to this little lights most twinkled brightly in the night sky this moving sign is called almost a graph there are more than eight thousand lights in this one and with a life of only six to eight months to a glob rarely a day passes without thirty or forty having to be replaced no all his knees are shaking that's the way in our delirious superstition among these fellows cats feet are a lot more help than rabbits feet of course in a forty or fifty mile an hour gales there's an old three on a match well after all a fellow can fall only once they say once you get going there's nothing you can do about it so why worry what the sign monkeys are only a part of the crew it takes to keep the bright light bright an electrical engineer is always on the job and what are brick to give him he rates an elevator going up on your floor fifteenth please electrical good done glassware look in this control room one hundred things to watch all at one time this is the flasher it controls the lights that move around the big circle the flasher is simply a rotating drum on the face of this drum are what are known as contact plates the metal strips or brushes along the side are lined up opposite the contact on the drum each contact and its brush controls a group of what's on the side naturally the more contacts and brushes there are turning groups of lights on and off the more combinations will have the pleasure control as three hundred and five separate contacts the largest one of the world here is the machine that controls the clock hands and it is kept the clock in perfect time for over a year without a slip this is the control for the moving most of graph you want to know how it works well every lightbulb connected by a wire to a small contact point or bright the tip of the brush presses against a copper plate and the return wire carries electricity through the plate brush and wire to light the lamp a strip of paper inserted between the copper plate and the brush to stop the flow of electricity and the lights go all but wherever a hole in the paper lets the brush touch the copper plate electricity flows through again and lights the bulb no matter how many light bulbs and brushes are connected each of them operates the same this i almost a graph sine panels started with thousands of light bulbs and this is the contact board on the motor graph control carrying thousands of brushes each light bulb on the sign panel connects to a brush on the contact board a copper plate is hinged to the contact board and a wire goes to the plate as the copper plate is pressed against the brushes electricity passes from the plate through the brushes and wires to the lights and they all go on if a strip of paper is passed between the copper plate and the brushes the lights will all go out but wherever holes in the paper permit any brushes to touch the copper plate the lights connected to these brus will go on the message is punched in are all of heavy paper like a player piano roll when the paper travels between the brushes and the copper plate different groups of lights on the sign panels pleasure on and all when running makes you think the lights are moving when they are not now let's have another look at the motor graph control these wires leading from the lights all connect with the brushes at the back of the contact board the paper carrying the  message is put between the brushes and the copper plate door then the plate goes against the paper and the brushes are clamped to the place the rest of the paper record is put on rollers so it will run through the motor grabs smoothly the switch  turned on the motor grabs goes into action and the animated message is flashed across the display and so clambering over the face of this giant of the night the man behind the bright lights has only to be a combination engineer electrician strongman juggler the man on the flying trapeze anyhow there is very little traffic up here just think of the poor  dodging back and forth among those cards what chances people do take fellow is certainly a lot safer up here