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�book from day to day. You will date your field book from day to day and enter the several transactions of your survey as they occur at the time they actually take place; and complete the same on the spot. Should you at any time find it necessary to alter any of your lines, marks or monuments, you will note such alterations in your field book as of the date when made, and not alter the entries formerly made; but you will so enter the several transactions in your field book that it may be a faithful narrative of occurrences as they happen from day to day. You will add from time to time, or at the end of your field book such observations and explanations as you may deem necessary. You will ascertain the variation of the compass as nearly as practicable as often as it can be conveniently done & enter the same at the time and place when ascertained in your field book. You will state how all your lines are run by the magnetic needle in your field book. When from the intervention of insurmountable obstacles it may be necessary to ascertain any distance, otherwise than by actually measuring the same on the ground, you will enter in your field book, the process by which you ascertain the same. In making this survey the measure is to be exactly horizontal as far as practicable. You will employ faithful, intelligent and experienced chainmen, and all your assistants are to be faithful & capable of performing the duty assigned them. Should you find it necessary to employ assistant surveyors, you will take care to employ men of integrity and good judges of the quality of land & well skilled in surveying; and see that the duty you assign them is faithfully performed. In surveying the townships on the line run due West from the Monument, it will be nec -