From time to time there have been some here, but got consumed. There are boxes of tuning gangs from deceased estates which have not been fully investigated. So there may well be others here.

I believe that they are named for the shape of the rotors as they are like a butterfly wing and many are going to be linear, by the way they are cut. While there has been a lot of moving around there are only two locations where they will be stored.

I am sure the Yaesu Comms receiver has some in it.

Marc

Marc, if you happened to fall over one let me know.
I had a good look in my stash boxes and cannot find it.
Have a horrible feeling it may have gone in one of my occasional clean ups.

The gang is exactly as you say butterfly (or bowtie) rotor and the stator is the left over punched out of a circle.
The stator plates are held in an X shaped frame that carries the bearings.

cheers, Fred.

I will have a scout around later in the day. Its daylight so its a plumbing cycle, sorting out pumps, ball taps that leak and patch up fixes..

Naturally the sprinklers are full of anti matter and they will block every nozzle despite the line having provision for clearing 'dead ending' muck and flushing the line.

Marc

I know of another box which I think is all domestic radio types, however, I did find one that is in the style of the standard very common Stromberg - Carlson type. Ceramic body but full circle. I will send Brad a photo of it. Have not measured its capacity but it looks like it will take close to 500V perhaps more.

Pics sent 160pF may need a tad of straightening. My normal check for arcing is 500V DC principally the oscillator gang, as its often hot.

Marc

Thanks Marc, if it all fails, I am going to engineer a rotating one using some standard plate pressings and fabricating a frame and bearings.
But. I'd rather not and I'm too sick to stay in a hot workshop so the job will go onto the back burner until next winter!!
Like you I have "advanced heart lung disease" (hospital speak) and cuddle up to the aircon, can't take any humidity or heat.

Cheers, Fred.

Heat has never been a major issue for me. I have worked in vineyards and there is not a great deal of protection there. You, believe it or not dress in heavier clothing and a long sleeved shirt & a hat has to have a brim. You must also have plenty of available water. Nothing to use 7-8 litres on a day around 35.

Heart is not such an issue Aviation medic picked up on it. Apparently it one of those that will go so many beats stop for one & then repeat the cycle. One doctor came up with the brilliant idea of Heart pills, which caused issues, so he prescribed others that should not be prescribed when you show an allergic reaction to the previous one?

On that; I went into hospital to sort out a reoccurred hernia (accident aged 16) & one I was born with while he was at it. One should have seen the shocked look when asked if I brought in my medications: There we none to be brought.

Respiratory system was always prone to bronchitis usually initiated by working in a lab that had a mechanical testing section at constant 20 degrees & constant humidity. The chemical section, for years had only venting and in summer it was constantly over ambient temp. That rapid temp change caused havoc. Several sections of the factory like the dye house were not much better in the summer.

It was the dye house and a laundry, where I was a dyer. They were the ultimate destroyers, one incident was caused by neglect by a person not covering a drum and the later a management person doing what I told him not to do. Decomposing Sodium Dithionate is not good for the respiratory system. Nor is Sodium Hypochlorite in hot water, dumped into the laundry's open gutters.

Most of the other issues are just mechanical from heavy farm & industrial work; like missing disks in the back & owning a motor cycle.

As noted this building is positive vented and the fan is a swampy air con.

Photos uploaded to Post 19.

I once worked at a large private school. The primary water treatment for the swimming pool was sodium hypochlorite. There were two 1,000 litre barrels of it which would last a couple of months, from memory.

It was body in the barrels stuff. If one fell in, they'd better know how to get back out again in a hurry - a big hurry. There was a safety shower and eyewash station in the same room as the hypo. I am not sure how effective they'd be after someone got a good soaking though.

If you have alkaline substances like sodium hydroxide they are hard to wash off. One always keeps Vinegar to pour on it as it much easier to wash off & neutralise it.

I use Sodium Hypochlorite here, as a biocide for the rain water tank. What goes into it can be interesting.

Marc

Re photo #19. Thanks for the try Marc.
I have that style of gang; I think they came out of D/D STC gear.
At a pinch 150 pf would give a wobble just wide enough to be useful.

The gang I am using has about 700pf (2 x 350) and ball races at either end, that is it is meant to be spun continuous.
No idea what the original application would have been.
It is perfect except for being out of balance and nonlinear.
A bow tie gang would be perfector being in balance and I suspect linear.

The 700 pf allows a wide range of adjustment of sweep width, you can sweep the AM band for instance.
Switching in series capacitance allows me to control the width.

It's frustrating as I have hoarded that bunch of special gangs for decades.
I have looked everywhere for the bow tie unit I have/had.
It's gone to that special place where things go when you want them!

Keep an eye out please everybody for a bow tie.

Fred.

I did pass one onto a radio collector / ham, to match up a transmitter antenna I recalculated. He's got some junk there. I am damn sure that there have been a few here in the last 60 years, or more.

I have a couple of storage cabinets hemmed in by another persons junk / household effects, don't think there are any in there?