200B Sound Conversion

In 2007, I acquired something I had not come across before, a 200B, with a proprietary sound unit by Southern Film Services of Slough.The unit appears to be incomplete; it is not clear to me just where the photocell might go. Anyone got any info? I have also found instructions on how to do the conversion yourself. 

The first 2 pix below come from Don Sykes. They seem to be a different type of soundhead. Bill Kilgour sent me the others some time ago; they show how the cell has to move out of the way for threading. Not sure the amateur one from ACW don't look better. 

Here is another 200B add-on unit. Then some old ebay pix of a Pathescope "H" with an add-on sound unit, a thing I had not previously seen, found for me by Mikael Barnard. After he first mentioned it, I did find a passing reference in an advert .

The 200B Plus below was also brought along by Mikael Barnard. The sound attachment (from Cine Craft) is not a type I have seen before and is joined by what I think is a very neat little governor attachment, intended no doubt to stabilise the sound speed. I suspect tho' that it may have had the same problem as the Son (ugh!) with the governors being over-worked.

The sound head seems to have been modified to use a solar cell rather than the original PEC, and is clearly in need of a little TLC. The design of the lamp housing seems to enable use for both 9.5 and 16. Pic 2 shows it just located in its mounting holes,; Pic 5 shows it pushed in to operating position. The screw next to the sound telescope may be to adjust for sound track position? I think the governor is a splendid concept and very compact, presumably an addition by whoever bought the unit. It uses a Meccano(TM) socket coupling as a pulley. The last pic shows it with the lid off. Looks like a prototype, with evidence of bits that didn't quite work out.  

I thought I should give Pathé Baby sound a strip of pix.

These are mostly American, courtesy Dino Everett, apart from the plucky British entry at the end.

Sound-on-disc also extended to Bolex.

I found the third pic on the front of a Perry's Home Movies mag and tweaked it a bit. Pic 4 is an amateur SOF conversion and pic 5 shows even the most basic machines coiuld be adapted for disc sound. 

More generic stuff on SOD; alas, only after the cinema had abandoned it so no commercial film tracks were available.

This also seems a good place for the pix Tony Reypert kindly let me take of an incomplete but still fascinating sound-on-disc projector he recently found, plus some less good pix of better-preserved machines. You could make your own records/sound tracks to play on such machines. See also under 16mm for shots of the earliest sound-on-film machines.

Here are some pix of my own SOD machine, itself a "gift" from Uncle Tone, obviously much mutilated and in need of TLC.