Popular science monthly . The small balls are split and may be openedup with a knife-blade and a chisel of the chain instead of being just afastening means. To do this properlythe parts are laid out on a bench, andthe balls clamped over the ends of thepins with pliers.—E. B. Willi.\ms. 6U An Easily Made Self-Locking Devicefor Barn-Doors THE drawing sliows a self-lockingdevice that is very useful on barndoors to prevent large animals fromentering or leaving the buildings at will. It permits a full amount of light andair to pass the doorway, and is easilyset aside when not needed. 11 is made as
Popular science monthly . The small balls are split and may be openedup with a knife-blade and a chisel of the chain instead of being just afastening means. To do this properlythe parts are laid out on a bench, andthe balls clamped over the ends of thepins with pliers.—E. B. Willi.\ms. 6U An Easily Made Self-Locking Devicefor Barn-Doors THE drawing sliows a self-lockingdevice that is very useful on barndoors to prevent large animals fromentering or leaving the buildings at will. It permits a full amount of light andair to pass the doorway, and is easilyset aside when not needed. 11 is made as follows: Chisel a mortisein right-hand door-post 5H i- ,14 in. wide and in- deep. Cut aslight vertical groove over the topii<l in. wide. Then bore a 3^-in. holeat right angles with the mortise i in. from Popular Science Monthly Round the opposite end of this hard-wood bar to tit the iy2-m. auger holein door-post.—Gale 2J2 in. longer than A self-locking bar across the bam door-way to keep the large stock in or out the top and i}i in. from the front for apin. Place a wood dog of i-in. oak inthe mortise and insert pin through thedoor-post and into a 9/16-in. hole in thedog, suspending it to swing freely. Inthe left door-post bore a iH-- hole toa depth of i^ in. Select a bar of hardwood 2 in. h\-3 in. and cut itthe e.\act width ofthe doorway. Atone end make atenon i in. long by1I4 in- wide, andnearly the tiiiik-ness of the the twocorners a Irille onthe up[)er and low-er sides, that itmay be casi 1 yraised and lowered. Two Types of InexpensiveDepth Gages ONE of the handiest tools for all me-chanics is the depth gage. One can easily make a gage thatas well as practical. In the illustration thelower figure shows a sim-ple gage made of 3^ wire and a smallpulley key; the measur-ing rod is locked by asmall thumb screw. The upper figure is anautomatic locking gageof steel or wood, pres-s
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
