Listing ID #3823624
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Contact Supplier A well balanced, machined aluminium disc rotating smoothly at about its axis and clamped on tripod stand in vertical plane. The disc moves on ball bearing and has number of holes placed symmetrically in concentric circles of known diameter. Four pins carrying scale pans can be inserted into the holes at any desired position. Complete with horizontal graduated mirror scale, plumb line, levelling screw, two side pulleys and 4 scale pans.