HELAVA,UUNO,VILHO AT THE NATIONAL-RESEARCH-COUNCIL-OF-CANADA FROM DECEMBER 1953 TO SEPTEMBER 1965

The Canadian government's imaginative approach to fostering scientific excellence produced an environment ideal to draw the very best from U ki Helava's fertile intellect when he joined the Photogrammetric Secti on, Division of Physics, NRC, Ottawa in 1953. Initial work on error co ntrol in aerial triangulation led into the design of instruments for i mage measurement. This work culminated in the production of the NRC Mo nocomparator, but Helava's main effort was devoted to the analytical p lotter, for which a working model was exhibited in 1963. Difficulties with the commercialization of this device led to Helava's decision to leave NRC in 1965.