Hi. Thank you Walter.
I have found this. I don't know if someone posted it here before.
The original text is written in Spanish, so I have used Google Tranlate.
https://translate.google.com/translate?sl=es&tl=en&js=y&prev=_t&hl=es&ie=UTF-8&u...http://www.funjdiaz.net/folklore/07ficha.php?ID=3573The same from other source.
http://www.cervantesvirtual.com/obra-visor/el-chasquido-de-la-honda-en-el-aire-m...I think the most interesting part is a 18th century description of a sling.
Quote: In 1734, the Dictionary of Authorities of the Royal Academy defined in detail the object to which we are going to dedicate the following pages: "An instrument made of hemp, esparto *(Stipa tenacissima), wool or other material, the length of one vara and a half *(the Spanish vara was set at about 835.905 mm (32.91 in) in 1801, so 1.5 varas are about 1253.8575mm = 49.3645''), and in one end it has a ring made of the same material to secure it in the middle finger, and in the other a silk tassel. In the middle of this instrument which is made of braid, there are two branches side by side, from four to five fingers long, which rejoined with the sling, they form somewhat like a box, in which the stone is secured, so that it can be cast without dropping. It is a weapon which was used in the war, and was peculiar to the Majorcans, and nowadays shepherds use it to govern the cattle, and to frighten the wolves: and also the boys to go to stoning. It comes from the Latin Funda, which means the same.