An extract on #kalite
Such plaster is applied in thicknesses of up to 1.5 inches. As compared with other sound insulation, it is easy to apply and is fireproof but it can be more fragile, being affected by physical stress and humidity. Acoustic plaster is used in construction of rooms which require good acoustic qualities such as auditoria and libraries.
Proprietary types of acoustic plaster developed in the 1920s included Macoustic Plaster, Sabinite, Kalite, Wyodak, Old Newark and Sprayo-Flake produced by companies such as US Gypsum. These superseded felts and quilts as a common preference of architects but were difficult to apply and so were superseded in turn by acoustic tiles.
Sevim Tekeli was born in Izmir in 1924. She received primary education in different cities of Turkey, since her father Osman Nuri Tekeli was working as a governor in various provinces. She is a graduate of American Girls' High School of Uskudar.
She obtained a bachelor of arts degree in philosophy at Ankara University. She was attracted to the history of science during her undergraduate studies under the influence of Aydin Sayili.
Sevim Tekeli's works mainly focus on the history of Ottoman astronomy, particularly on the works of the famous Turkish astronomer Taqi al Din.
When Professor Tekeli started her doctoral studies, it was very hard to find any scientific study and materials in Turkey concerning the history of Ottoman science. She determined to overcome such problems. Eventually, Tekeli overcame all these challenges and completed her doctoral thesis, "The comparison of the observational instruments of Nasir al Din al Ts, Tycho Brahe and Taqi al Din", under the supervision of Aydn Sayl in 1956. Her doctoral thesis in which she made comparisons between Nasir al Din al Ts, Tycho Brahe and Taqi al Din in terms of observational instruments they had used was later published with the same title.
She also interested in the development of scientific endeavour in the 17th century Western Europe and also, in comparing the developments in Russia at the time and in the Ottoman Empire in terms of scientific activities and achievements. She also examined the effects of the Ottoman Empire on Renaissance. She particularly analyzed the reasons behind the superiority and leadership of the Ottoman Empire in the Islamic World at the beginning of the 17th century.
She continued her research on Taqi al Din and published another book, The Brightest Stars of Construction of the Mechanical Clocks that was based on her professorial thesis. In this book, she revealed that Taqi al Din was one of the most important astronomers of the 16th century. She has also studies concerning the map of Piri Reis and Muhyi al Din. She was one of the earliest Turkish scholars uncovering the astronomy activities during the period of Ottomans.