Mendeleev's predicted elements
Dmitri Mendeleev published a periodic table of the chemical elements in 1869 based on properties that appeared with some regularity as he laid out the elements from lightest to heaviest. When Mendeleev proposed his periodic table, he noted gaps in the table and predicted that as-then-unknown elements existed with properties appropriate to fill those gaps. He named them eka-boron, eka-aluminium and eka-silicon with atomic masses 44, 68 and 72 respectively.
Thomas Fale
His only known publication is "Horologiographia" (1593). It is dedicated in Latin to all lovers of mathematics in the University of Cambridge. There is also a prefatory letter to ‘my louing kinsman,’ Thomas Osborne, who had invented the instrument mentioned in the beginning of the book ‘for the triall of plats,’ dated from London, 3 January 1593. The table of sines which it contains is probably the earliest specimen of a trigonometrical table printed in England.