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 Post subject: Re: Gas Lamps
PostPosted: Sat Apr 30, 2011 11:40 pm 
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I was thinking the battery unit could be wired in a way that it operates the photocell which in turn 'widens' the gas flow at night and by day the gas flow is narrowed making the 'flame' less noticeable. The box could have been mounted in by opening one of the panes as the ones in Horsham have 'pane doors' fitted so that the 'flame' part of the lantern can be replaced if necessary.

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 Post subject: Re: Gas Lamps
PostPosted: Sat Apr 30, 2011 11:55 pm 
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Well, solenoid valves can operate momentarily off a battery supply (think of the flush mechanisms for urinal cisterns - the PIR sends a pulse to the solenoid to open the valve, and when done the PIR Timer sends a pulse in reverse polarity to the solenoid to close it), and so these only use power for a split second. the valve is either '1' (open) or '0' (closed), and so all you need is a photocell unit to work off batteries and send a pulse at nightfall to change the valve to the 1 position (and a seperate series of pulses sent to the mantles to ignite the gas), and in the morning a reverse pulse should be sent to close the valve. If the batteries are dead the lantern will either dayburn or be off at night.

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 Post subject: Re: Gas Lamps
PostPosted: Sun May 01, 2011 12:49 pm 
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So the gas lamp lighter featured in the BBC FOUR programme doesn't have to light all 1,600 lights after all!


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 Post subject: Re: Gas Lamps
PostPosted: Fri May 27, 2011 1:25 pm 
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Chris has taken some excellent photos of the gas lanterns in Leeds:

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 Post subject: Re: Gas Lamps
PostPosted: Fri May 27, 2011 11:57 pm 
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Thanks Alex... believe it or not, the close-up photos are again using my technique of sticking the camera to look through binoculars!

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 Post subject: Re: Gas Lamps
PostPosted: Sat May 28, 2011 9:47 am 
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Those are excellent pictures. Well done. It just dawned on me that those lanterns which don't work, may have flat batteries for the photocell operated valve.


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 Post subject: Re: Gas Lamps
PostPosted: Sat May 28, 2011 10:28 pm 
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Very possibly. As I think I've said before, the valve will be a 'flip flop' operation valve, whereby power is only needed to change the state of the valve... if the batteries could not power the valve when the lantern was on then it would dayburn - and so if the lantern stays off then the reverse may be true.

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 Post subject: Re: Gas Lamps
PostPosted: Sun May 29, 2011 11:34 pm 
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I wonder if some of the gas lamps that still exist are listed in the same way that the Richardson Candles now are?


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 Post subject: Re: Gas Lamps
PostPosted: Sun May 29, 2011 11:53 pm 
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I don't know....... I think the Candles are the first street lights to ever get listed status.

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 Post subject: Re: Gas Lamps
PostPosted: Tue May 31, 2011 12:10 am 
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mazeteam wrote:
I don't know....... I think the Candles are the first street lights to ever get listed status.


If so , then it's a very well-deserved honour!


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