Boyle’s Law Apparatus, Aluminium Extrusion

Similar to Cat No. 1020900 in operation, but having bottom zero scale fixed to a specially designed aluminium extrusion having rectangular cross-section in place of wooden back-plate. Sliding brackets with both the glass tubes sliding vertically on the slot on either side of extrusion instead of metal support rods. Requires mercury for use, not included (available optiolly) .