No. 1027

Pascal's Vases

New Design

The most satisfactory form of this apparatus yet invented. The pressure is exerted on a sensitive metallic diaphragm, similar to that in an aneroid barometer. The movements of this diaphragm are multiplied by a positive acting rack and pinion device, and the indications of the hand on the dial may be clearly seen across a large class room. The adjustable supply tank shown in the illustration permits of easy and rapid filling and emptying of the vases without any spilling of water. Furnished complete as in the illustration.

Net $6.65

CENTRAL SCIENTIFIC COMPANY

412-420 Orleans Street,

Chicago, U. S. A.

(OVER)

A211A-216-3