Popular Science MonfltJy
��of cast-iron, pri-sscd into the head fast- ing; the piston-rings are also of that material. The heaviest parts made of aluminum are the pistons, cylinder-block, cylinder-head and crank-case. The pump, water connections, \al\e-motion co\er and fan are also of aluminum. The \al\e-actuating rocker-arms are alumi- num-alloy die-castings, the taf)pet-rods are also of aluminum alloy. Since aluminum is a soft metal, it would not be practical to run pistons of that ma- terial in c\'linders of the same kind, so accurateh' machined cast-iron cylinder liners arc pressed into the cylinder-cast- ing to guide the pistons. An engine of this kind will weigh considerably less than one of the same size made entireh- of cast-iron and steel, it being possiijle to save several hundred pounds' weight without any sacrifice of strength in an engine of fift\' horsepower.
��A Bottle- Stopper Which Controls the Outpour
AVERY good makeup for a special bottle-stopper intended to let out onK- a small portion of liquid such as |)erfume or the like, at a time, is shown here. It also makes it impossible for the stopper to be removed without
���The ball within the stopper allows only a small portion of the liquid to pass out
detection. Into the cork portion .4 is fitted the metal part B which has a ll.mged portion so as to cover all the top
��surface of the cork. The end is made as represented, the ball being placed inside in order to prevent escape of the li(iuid except in small portions. A cap of metal foil fits over the neck of the bottle and the upper flanged part of the stopper, so that to remo\e the latter necessitates breaking the nutal foil.
��A Gage Which Tells the Amount of Moisture in Wood
A GAGE that ascertains with accuracy the amount of water present in lumber has been put on the market. In
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��Gage usecj to determine the amount of shrinkage in wood in process of drying
appearance it closely resembles otiicr commoner forms of gages used for other purposes, but its markings are different. A section of the wood to be tested is cut from the lumber and placed between the gage-jaws. The sample is then rcmo\cd and thoroughly dried in a kiln. When the sample comes back from the kiln, it is again measured and the amount of shrinkage is noted.
��Mending Picture Frames with Laundry Soap
APICTIRE may often be bought at a reduction in price because of a ilaniaged frame. A badly marred or chipped frame can be easily and elTectu- all\- mended with common brown laun- dr\- soap. Fill in the portions broken awa\- with the soap, which can be molded with the fingers into any desired >h.i[)e. Let it dry thoroughly and it will be as hard and strong as it is ne- cessary for it to be. (iilfi or paint as the case requires, and the frame will look like new. — Jennie E. McCoy.