Dear collective wisdom,

A student at my institution is researching a work by Lola Álvarez Bravo and wanted to know what the circular objects are in the attached image (not the coins but the three slide carousel-looking things). More information about the work can be found here: http://ccp-emuseum.catnet.arizona.edu/view/objects/asitem/People@60/46/title-asc?t:state:flow=ca19bd30-e5b9-400e-ad78-739b7ca4b4f8. This article (in Spanish) also refers to it vaguely as a money-making machine, but the student is wondering what exactly the object is. Anyone have any ideas? 
El sueno de los pobres.png
Thanks in advance for any leads,
Andrew
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