Democratic Sentinel, Volume 19, Number 16, Rensselaer, Jasper County, 26 April 1895 — A MEASURING STOPPER. [ARTICLE+ILLUSTRATION]

A MEASURING STOPPER.

New and Convenient Device for Household or Laboratory. The accompanying cut shows what the Inventor calls an “autometric stopper,” that Is to say, a “self-measuring stopper,” which is sure to come into general use. Its many advantages are apparent. It Is at once a permanent stopper, which will never break nor get “stuck,” and a graduated measure, always ready for use. Besides, it is reserved for the one fluid in which it Is used. The stopper Is composed of a rubber bulb attached to a graduated glass measure. When it is deslfed to get the fluid out of the bottle, the stopper is loosened, the bulb is slightly compressed and the fluid rises to the glass tube. The quantity of fluid brought up into the tube depends upon the amount of pressure upon the bulb; it may be filled, or only partly so, as may be desired. To use the stopper as a measure, the bulb is entirely compressed and the pressure is then relaxed, when the fluid Immediately fills the tube. Then by lightly pressing the small bulb between the thumb and the finger, an air-valve is opened, which permits as much of

the fluid to flow out of the tube as you may desire. In using the autometric stopper there is no pouring out of the fluid and consequently no spilling or wasting of it. It is clean, safe, economical and convenient.

THE AUTOMETRIC STOPPER.