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Love the Gothic on the front cover. Thankfully not continued inside.
The Brunsvega reminded me of my computer course at Wandsworth Tech in the early 1960’s where it was used to introduce techniques of multiplication on the basic computers of the era. I later programmed mainframes that did not have hardware math units to do multiplication using the shift and add principal from these machines! So if your bank interest in the 60’s/70’s was wrong, it was probably me.
Roy.
It slooks like the Sky at Night will be touching on this next sunday.
“Beyond the Visible
The Sky at Night team discovers the new techniques being pioneered by vision-impaired astronomers to see the universe, using their senses of hearing and touch.”If a smaller diameter (22mm?) carbon fibre tube is rigid enough then you could try a split sleave of thin 1 inch diameter alluminium tube over it for the grub screw to bite into. This would spread the load on the carbon composite. I note (on ebay) that the clamps sold for carbon fibre tubes are not dissimilar to (posh) pipe clamps, so it might work.
Roy
I was curious. So I googled around and found this site giving a DIY version of what you are trying to do.
Certainly looks do-able, advisable?, who knows.
https://www.skyimager.com/mirror-lock.html
Hope this helps.
Roy
They’re all at Heathrow.
Flightradar24 is showing a reasonable but not large amount of activity in the SE right now with a massive pileup at LHR 🙂
Film of the 1960’s was certainly ‘Safety Film’ and 35mm was often marked as such outside the sprocket holes. I don’t think the explosive stuff was around post WW2. Of more concern is colour shift. The dyes used in colour slides are not that reliable over time. It’s a very good reason to digitise them now and correct them where necessary. I’ve got some commercialy produced Kodak slides that (since 1973) have realy shifted, to the extent that I would not show them again. Mind you, they were not wonderful when new. B&W film and slides (especially home processed) of course don’t shift with time.
I’ve found a good write up on film base at: https://www.nedcc.org/assets/media/documents/Preservation%20Leaflets/5_1_FilmBaseGuide.pdf
Someone has beaten you to it.
Just found a 3D printed adaptor on ebay!
“Telescope red dot finder to Camera Hotshoe mount New 3D printed”
Roy
A few years ago I experimented with a cardboard gadget [some assembly required!] that was supposed to enable a regular scanner to do negatives and slides – search for:
How To Scan Negatives Using A Standard Scanner
and you should find it. I gave up and got a cheap scanner at Maplin. Sorry, not astro slides – just our street party in 1977.
Interesting results.
With only two surfaces the tolles was always considered to be “bright”, but of course at that time these eypieces were not coated.
There seems to be a problem with the post, the image of the results just shows a broken image symbol, however the click through to your members page works OK.
Roy.
Glad to see Ponder Stibbons has finally recieved the recognition he so richly deserves after so many years sterling work at UU.
Roy
I prefer to try methelated sprit (alcohol) first, it’s less likly to remove the paint as well as the glue.
But if that fails, white sprit should do the job.
Roy
A google search for BJD date found http://astroutils.astronomy.ohio-state.edu/time/utc2bjd.html
This in turn leads on to ‘source‘ (at foot of the page). Maybe this would help.
Sorry, I don’t understand a word of it but it may mean somthing to you.
Roy
Nick,
Thanks for the videos. I was not able to get to the meeting and they are a real help.
However, I don’t know if it’s just my set-up but, there’s somthing weird going on with the downloaded MP4 videos.
Thin horizontal lines flicker. In the starfield shots, random stars pop into and out of existance on an about 1 to 2 second cycle.
Is this due to the transcoding to MP4?. Are there any parameters you can twiddle to stop it?
Roy
Hi,
Assuming that portability is important. I wonder if a stiff bungee cord attached to the tripod head and an ‘auger earth anchor’ (see GOOGLE) under the centre of tripod might hold things stable enough for your purpose? A bag full of sand (much beloved by eclipse chasers) might swing in the wind and be more of a hinderence than a help. But an auger would put the whole thing in tension, with the whole planet on the far end!
Roy
Had a look at the data sheet for the roofing material you used and it states “UV stable for 3 Months”.
Looks a bit iffy for this application.
Roy.
David,
Home made devices might do as well(?).
Quote from a much earlier post, re. devices we made in the 1960-70s:
‘In 1974, vol 84, no 3 (April) page 189 D. G. Daniels describes a similar device looking a bit more like the one I built (long since gone to the scrapbox in the sky). If you’ve got a fast connection you can download a copy from the BAA (6.57Mb) a real blast from the past. If you do, then, rather than spend hours trying to scroll to the right issue do a search for time-switch (the “-” IS important!)’
Roy.
You seem to be using LibreOffice (AKA Open Office) Calc on a Microsoft Excel spreadsheet.
The Macro language (which programs buttons) is not compatible in my experiance.
There is a Microsoft “Viewer” application which MIGHT work if you download it.
I had to recode all the macros in my spreadsheets when I ported to Open Office from Excel, a non trivial task.
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I’ve since checked… and the Microsoft viewer won’t run macros either!
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Roy
