Travel-arm.—The arm pivoted on the platen.
Azimuth Correction-scale.—The sliding scale below the platen.
Deflection-scale.—The fixed scale immediately above the azimuth correction-scale.
THE DEFLECTION-BOARD
Fig. 66.
Travel-arm.—The arm pivoted on the platen.
Azimuth Correction-scale.—The sliding scale below the platen.
Deflection-scale.—The fixed scale immediately above the azimuth correction-scale.
THE DEFLECTION-BOARD
Fig. 66.