R Ro Ro Ro Ro Ro R Roc cí ío o C Ca ar rv v v r rv va aj aj aj ja al l A Al Al lc ca ai id de e Research S St ta ai ir rs s i in n t th he e A Ar rc ch hi it te ec ct tu ur re e N No ot te eb bo oo ok k o of f J Ju ua an n d de e P Po or rt to or r y y C Ca as st tr ro o: : A An An n I In ns si ig gh ht t i in nt to o R Ru u u Rul le ed d S Su ur rf fa fa f fa f fa f fa f f c ce es s A Ab bs st tr ra ac ct t. . Historic treatises on stonecutting of the sixteenth and seventeenth centuries contributed to progress in the study and understanding of properties of the different surfaces and the intersections between them. One of the topics that contributed most towards the development of knowledge of the geometry of surfaces was the practical use of ruled surfaces.Defining the geometry of a piece of stone by surfaces that can be cut using a ruler as a guide and a check has always been considered very interesting in the field of stonecutting. This present study focuses on stairs in two Spanish treatises to illustrate how warped surfaces were treated.
El cuaderno de arquitectura de Juan de Portor y Castro forma parte del repertorio de manuscritos dedicado al corte de cantería en España. Redactado entre 1708 y 1719, es testimonio de una tradición donde la evolución de los métodos de labra tenía en estos cuadernos personales su medio de difusión entre especialistas de un mismo gremio. Presenta un amplio número de cortes, donde destacan por su relevancia lunetos y escaleras, presentes en la práctica constructiva habitual de la época y poco tratados hasta su aparición en esta obra. Comparte el carácter didáctico de obras representativas anteriores, como las de los autores Alonso de Vandelvira y Ginés Martínez de Aranda, sin perder la espontaneidad propia de un cuaderno de taller, donde quedan plasmados los intereses de los maestros que contribuyeron a su redacción.
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