Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

MOLESWORTH’S . Jwktt-tali of ewnttrrag ^ranralu. Chain Surveying. INACCESSIBLE POINTS. By Fig. 1. Measure off perpendiculars A C, D E, ranging the point C in line with E B; then 4 „ AC x AD ab~de-ac' By Fig. 2. Fix any line II K and bisect it in J, Make JL = JF, and range I in line with H L and with J G; then L I = F G. By Fig. 3. Set off O M at right angles to O P and M N at right angles to M P; then By Fig. 4. Set off R T at right angles to R Q and bisect K T in U. Set off T V at right angles to R T until T ranges in line with Q U; then T V = E Q. B