Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

Forfatter: Guilford L. Molesworth

Sider: 744

UDK: 600 (093)

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6 Molesworth’s pocket-book Ai-proximate Measurement of Heights WITHOUT AN INSTRUMENT. Measure any convenient length D on level ground; erect a staff firstat one extremity, and ascertain the distance y from it at which the line of sight cuts the top of the staff and the object; then erect the staff at the other extremity of D, and ascertain the distance x in the same manner; deduct the height of the eye from the length of the staff to find h. H = + h 4 E. x — y

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Pocketbook of Useful Formulæ and Memoranda for Civil and Mechanical Engineers

Digitaliseret bog

Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers