Check out: http://www.slideshare.net/alexdjabier/ejercicios-de-materiales-determinacin-de-cargas
Also, try searching google by image. http://www.google.com/insidesearch/features/images/searchbyimage.html
These sketches appear to be from a text we used in aeronautical engineering at St.Louis University,for statics and dynamics,the Spanish language version.
I'm certain it was authored by Beers and Johnson,this text was used back in the late 60's & early 70's,very popular standard statics and dynamics text here in the U.S.
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