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Re: Double loaders...

The FLH will definitely have curved walls. I was looking at doing this for the BLH simply for prettiness and to test my abilities (my guess was 5 layers of 3mm plywood). If they are allowed inside it will be because the missus says yes, and smooth curves are easier to veneer in my favourite (Tasmanian Oak) than losts of fiddly straight pieces.

Regarding Olson's design - I found the patent lacking (from a laymen's perspective, anyway). Obviously the design changes that he's brought in are the 'double coupling' (the holes called 21 in the design drawings are the end of second coupling chamber), the section in the front-horn (23 and 25) which works kind of like blowing over the top of a beer bottle. In the actual description, only points 13 and 15 reference this - the rest is just re-iteration of 'prior art' (even his 'dividing said cabinet into a pair of compartments' - said so many times it becomes a litany - is a product of his second coupling chamber). And he doesn't even include this second constriction of the bass horn in his 'electrical equivalent diagram of the acoustic arrangement' - although he does make a big show of the (hmm-mmm) idea for the front horn.

IMHO

But the patent does show that double loaders were well established by this time (1937).

I'll keep on looking - I'm going to go with my design, but it always helps to know what other people have done (either successfully or unsuccessfully).

J

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