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1202 — Leonardo Fibonacci demonstrates the utility of Hindu–Arabic numeral system in his Book of the Abacus. c. 1400 — Ghiyath al-Kashi “contributed to the development of decimal fractions not only for approximating algebraic numbers, but also for real numbers such as pi. His contribution to decimal fractions is so major that for many ...
A sliding glass door, sometimes called an Arcadia door or patio door, is a door made of glass that slides open and sometimes has a screen (a removable metal mesh that covers the door). Australian doors are a pair of plywood swinging doors often found in Australian public houses.
A revolving door in Turkey (counter-clockwise rotation) A revolving door typically consists of three or four doors that hang on a central shaft and rotate around a vertical axis within a cylindrical enclosure. To use a revolving door, a person enters the enclosure between two of the doors and then moves continuously to the desired exit while ...
In this era, the kitab-khana ("book house") was a term serving three definitions – first, it was a public library for the storing and preservation of the books; secondly, it also referred to an individual's own private collection of books; and thirdly to a workshop where books were made with calligraphers, bookbinders and papermakers worked ...
Possible tally marks made by carving notches in wood, bone, and stone appear in the archaeological record at least forty thousand years ago. [9] [10] These tally marks may have been used for counting time, such as numbers of days or lunar cycles, or for keeping records of quantities, such as numbers of animals or other valuable commodities.
Here’s what those little doors in old houses were for! What People Think the Doors For. ... and it would’ve made since to be able to stow a card table in a hall closet.
Earmuffs cover a person's ears for thermal protection. Earmuffs consist of a thermoplastic or metal head-band, that fits over the top of the head, and a pad at each end, to cover the external ears. Earmuffs were invented by Chester Greenwood in 1873. [199] 1873 Silo. Two farm silos. A silo is a structure for storing bulk materials.
Simon J. Bronner (ed.), "Book Clubs", Encyclopedia of American Studies, Johns Hopkins University Press, OCLC 213273863 + "Print Culture" Rare Book School (in Virginia) bibliographies: History of the Book in America: A Survey from Colonial to Modern; History of the Book in America, c. 1700–1830; American Book in the Industrial Era, 1820–1940