Text: the nickname "tiny" kjeldbk was awarded with the usual english sense of humor, because he was a big man who hardly fit into the cockpit of a spitfire.

Correct capitalization: The nickname "Tiny" Kjeldbk was awarded with the usual English sense of humor, because he was a big man who hardly fit into the cockpit of a Spitfire.

Text: it is an easy calculation for us, namely 3361.

Correct capitalization: It is an easy calculation for us, namely 3361.

Text: the problem was to determine the resultant vibration produced by all the wavelets reaching any point behind the diffracter.

Correct capitalization: The problem was to determine the resultant vibration produced by all the wavelets reaching any point behind the diffracter.

Text: but an object that is not physical and has no physical form, cannot be copied or reproduced in any natural pictorial form, just as it cannot either be experienced by low-psychic or clairvoyant sensory perception, but, on the other hand, only through high-psychic experiences.

Correct capitalization:
But an object that is not physical and has no physical form, cannot be copied or reproduced in any natural pictorial form, just as it cannot either be experienced by low-psychic or clairvoyant sensory perception, but, on the other hand, only through high-psychic experiences.