What did Bradis use when compiling his tables?
In compiling his famous tables of trigonometric functions, Bradis used the expansion of functions in a power series. This allowed him to formalize the calculation of the required values, but Bradis did a great job!
There can hardly be any doubt that V.M. Bradis, when compiling his tables, used primarily the published works of his predecessors. It would be unreasonable to click the adding machine, knowing that the world's first tables of logarithms appeared at the beginning of the 17th century, and the first in Russia - at the beginning of the 18th century.