Physical description

(1) Glass rectangular scale (1-(1)-6 inch); (2)ditto steel rectangular scale, (3) ditto metal cylindrical rod. Enclosed in black hinged box with purple velvet lining. 64.1 = steel scale, 64.2 = glass scale, 64.3=steel rod, 64.4 = box. See#62 “National Physical Laboratory Certified Standards”

Inscriptions & markings

On top of box labels: “Length Standards 3BA”, “National Physical Certified Standards 1.6 inch steel scale. 1.6 inch glass scale, 1.6 inch rod. For particular see certificate 1915” “40 6”. On glass scale engraved: “13.0 cNP” Engraved on steel scale “H.J.G. Melb Univ. 1915 ruled at 12.9 Celsius” . On glass scale engraved: “H.J.G. Melb Univ. 1915” “1,2,3,4,5,6”. (H,J,G, = Henry Grayson)