SURFACE TENSION BALANCE, SEARLE’S

The sturdy Frame is mounted on a rod fitted to the base & carries a spring steel wire stretched across it; the tension can be adjusted by the tightening of the screw. Metal pointer with a counterpoise is attached to the centre of the wire by a clamp and a pan is hung from the notch in the pointer and has a hook at its underside from which can be suspended a light weight rectangular frame or a metal clip to hold a micro slide edge. The tip of the pointer moves over a graduated scale, provided with rectangular wire frame, slide clip & 6 micro slides.