Jean_LAMESCH_Sliderules_Collection_NBX_JL

1798_RICHARDSON_GST_460mm

1798_RICHARDSON_GST_460mm

A Graphical Site Table (GST) for gunnery, by GEO W. Richardson from Chicago. Simplex model with brass, in excellent condition. Mahogany corpus, brass back side, 458mm (17") long. The bottom text "SLIDE RULE MODEL OF 1917" does not tell the exact age, which may be in the range 1917-1920. Booklet "Directions for using the Military Slide Rule" here.