Character amnesia
It is difficult to establish exactly how many different Chinese characters are in use today; the new HSK, a widely used proficiency test for Standard Chinese as a second language, tests over 2,600 different characters, whilst in 1988 the People's Republic of China published the "List of Commonly Used Characters in Modern Chinese" which contains 7,000 different characters. In Japan, where a smaller set of characters are in general usage, the Japanese Ministry of Education prescribes the teaching of 2,136 kanji in primary and secondary school in a list called the jōyō kanji, meaning "regular-use Chinese characters".
Chinese typewriter
Lin had a prototype machine custom built by the Carl E. Krum Company, a small engineering-design consulting firm with an office in New York City. That multilingual typewriter was the size of a conventional office typewriter of the 1940s. It measured 36 × 46 × 23 cm (14" x 18" x 9"). The typefaces fit on a drum. A "magic eye" was mounted in the center of the keyboard which magnifies and allows the typist to review a selected character. Characters are selected by first pressing two keys to choose a desired character which is arranged according to a system Lin devised for his dictionary of the Chinese language. The selected Chinese character appeared in the magic eye for preview, the typist then pressed a "master" key, similar to today's computer function key. The typewriter could create 90,000 distinct characters using either one or two of six character-containing rollers, which in combination has 7000 full characters and 1,400 character radicals or partial characters.