Occasions frequently arise in laboratory work when it is necessary to insulate a delicate piece of apparatus, such as a sensitive balance, from vibration. Various tables designed to eliminate vibration have been described (anonymous). Most of these tables require the attachment of iron supports to a load-bearing wall or the sinking of a support into bed rock. Occasionally the building construction or the type of underlying strata, or both, make such methods of mounting ineffective. The instrument stand shown in Fig. 1 requires no attachments. It consists of rigid table 34 inches high, 30 inches wide, and 18 inches deep. The legs are made from 4 × 4 inch lumber sheathed with cluarter-inch plywood to form hollow sides; these sides are loaded with lead shot, steel stampings, or any other easily handled, heavy material. When loaded, the table weights can easily be rembved through openings at the tops of the hollow sides, under the cover.