📖 Книга "Emmissivity of Heat From Various Surfaces With Special Reference to Warm-air Furnace Installations; Results of Comparative Tests on Covered and Uncovered Sheet Metal Surfaces Made in Connection With the Warm-air Furnace Investigation Conducted by the Engi".Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.