N.P.L. Horizontal projection machine, without stand or screen; dated 1916 N.P.L. Horizontal projection machine 1916
Screw pitch measuring machine designed by E. M. Eden designed c. 1915, at the NPL, Teddington, made c. 1919, with a wooden accessory box. Screw Pitch Measuring Machine 1915-1919
Eden's Screw diameter measuring machine; floating head type, 2" capacity with a pair of 14 t.p.i. needles. Eden's screw diameter measuring machine, 1916 1916