B62-458. FIELD SKETCHING BOARD. Central Manufacturing Co. Model 1913. Generally used by the Army Corps of Engineers in the field to sketch maps and the like. 12" by 15" sketching surface with scales and trough compass. Instructions on reverse. Includes three telescoping legs that extend to 41" and work smoothly. In a heavy duty metal case that has some empty compartments that may have held other instruments, "Manufactured by McFarlan Motor Co. 1918" in the lid. We've seen a few of these made by other instrument makers that are pretty beat up but the case has kept this one in nice condition. Fine 100-200