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Sprocket compilation PIC HEAVY

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If I remember correctly, the sprocket has limited rotation on the crank to position the ellipse in a different orientation to the crank giving the feeling of different speeds. Been a while since I have looked it up. Somewhere on the web I came across good info on it but I cant remember where
 
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Sprock-o-Matic, Rocket 2 speed
Miami Florida
patent 2693119, 1953

wow! - never seen that before. Very cool and interesting. Another thing to want darn it.
 
Have some more to post.


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3 Unknown, Possibly an Elgin, I saw what looked to be this sprocket in an Elgin Redbird camel back style frame of 1937 advertisement. Was hard to tell for sure if it was this sprocket in the picture.
Teens era Sears Master
 
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4-5 Unknown. I would love to know more about this one and country of origin. I bought it from europe.

British---Norman--used on sport 3 speed
 

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Emblem sprocket

here is a circa 1930 womens Emblem bicycle . I picked this up with extra parts , if you look at the two chain rings they are similar although a bit different .I have seen the larger of them on a mens Emblem bike ,you have it listed as Miami 1914ish womens...
 
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