MATH PUZZLE: Can you replace...
MATH PUZZLE: Can you replace the question mark with a number?Correct answers: 286
The first user who solved this task is Thinh Ddh.
#brainteasers #math #riddles
Oskar BarnackBorn 1 Nov 1879; died 16 Jan 1936 at age 56.German engineer who designed the first miniature camera (1913), the Leica I. Its commercial introduction, delayed by WW I, was made in 1924 by the Ernst Leitz optical firm at Wetzlar, Germany where he was employed. Barnack was an enthusiastic photographer from when only heavy plate cameras were available. As early 1905, he conceived using a reduced format negative, to be enlarged after exposure. He adapted his idea from equipment he made to take still exposures on samples of cine film to test their sensitivity and consistency before movie use. For this camera, Barnack established the standard 35-mm film picture size by doubling the standard 18x24mm cine frame. His invention had only 1/250 of the weight of a plate camera. |