It should be realized that this handbook does not cover all of the minutest details and short cuts that the field man obtains through practical experience on the ground. Every experienced man has his own way of handling the minor operations of field activities so as to save time. As the beginner acquires field experience the many minor uses and short cuts will become self-evident. The importance of Working out problems on the ground and thus obtaining practical field experience in all operations involving the use of the Abney can not be overestimated.

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