Popular science monthly . emoving the retard-ing strip. Every time a match is re-quired both hands are necessary to openthe box and extract it. The new box has at one end and in thebottom a cut-out portion so as to exposethe matches, only the ends being sup-ported against the uncut portions of thebox. In the corners, however, the boxis slit so as to provide a means fordrawing out the match. In use the box should be secured tosome object on the wall or wainscot atan angle by means of small nails drivenin the upper corners. In that positionall the matches will gravitate to thelower exposure end
Popular science monthly . emoving the retard-ing strip. Every time a match is re-quired both hands are necessary to openthe box and extract it. The new box has at one end and in thebottom a cut-out portion so as to exposethe matches, only the ends being sup-ported against the uncut portions of thebox. In the corners, however, the boxis slit so as to provide a means fordrawing out the match. In use the box should be secured tosome object on the wall or wainscot atan angle by means of small nails drivenin the upper corners. In that positionall the matches will gravitate to thelower exposure end of the box in positionto be grasped by the thumb and fore-finger. It is not a difificult matter to convertthe ordinary box into a receptacle ofthis kind for permanent attachment tothe wall. The sectional view shows howthis may be done. In order to refill itfrom a new box the inner sliding portiononly is removed, and when filled it isreturned to the stationary case which isfastened on the wall. 458 ropitlur Science Monthly. The Liquid is Thrown by the Pressureof Gas Generated in the Bottle A Home-Made Fire Extinguisher AN amateur mechanii- can casiK-L. make a fire extinguisher to workupon scientific principles tlic same as dothe ones used in large buildings. As inthe larger extinguishers, the liquid isthrown by the pressure of gas generatedby mixing a solution of soda (sodiumbicarbonate) and sulphuric acid. Thematerials necessary arc a bottle of abouttwo Cjuarts capacity, a piece of glasstubing a little longer than the height ofthe bottle, a rubber stopper to fit thebottle, and a small straight medicinalvial. By the use of an alcohol lamp, oneend of the glass tube is heated andbrought to a pcjint. The point is thenbroken of?, leaving a hole in the endabout one-sixteenth of an in. in diameter,and the tube is bent. If you cann(jt procure a stopper with ahole in it, one must be drilled to fit theglass tubing, wliith should be about one-fourth in. in diameter. Ilie next stepis to pu
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
