Announcing examination for student trainee for filling positions in 1. physics, 2. metallurgy, 3. chemistry, 4. cartography (grade GS-4 only), 5. engineering, optional branches, aeronautical, civil, electrical, electronics (grades GS-3 and 4 only), mechanical, mining, general and miscellaneous, $2,500 to $3,175 a year (grades GS-1 to GS-4), announcement 444.