Intermediate block instrument
Block instrument; SR. Intermediate slide-lever frame, 1-needle (red) 3-position/3-indication "On/Out/Off" in bezelled circular aperture. Beneath is a rectangular engraved-brass plate with rounded corners: "No.22 Langley Intermediate up Home and Distant", an alloy Maker's Plate, and an electroplated-brass catch-handled slide-bar. Cast-iron cabinet with wood front. Ex Liss SB.