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An Easily Made Self-Locking Device 

 for Barn-Doors 



THE drawing sliows a self-locking 

 device that is very useful on barn 

 doors to prevent large animals from 

 entering or leaving the buildings at will. 



It permits a full amount of light and 

 air to pass the doorway, and is easily 

 set aside when not needed. 



1 1 is made as follows : Chisel a mortise 

 in right-hand door-post 5H "i- long. 

 1,14 in. wide and 4.H in- deep. Cut a 

 slight vertical groove over the top 

 ii<l in. wide. Then bore a 3'^-in. hole 

 at 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 hole 

 in door-post. — Gale Pinckney. 



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 a 

 pin. Place a wood dog of i-in. oak in 

 the mortise and insert pin through the 

 door-post and into a 9/16-in. hole in the 

 dog, suspending it to swing freely. In 

 the left door-post bore a iH-'"- hole to 

 a depth of i^ in. 



Select a bar of hardwood 2 in. h\- 

 3 in. and cut it 

 the e.\act width of 

 the doorway. At 

 one end make a 

 tenon i in. long by 

 1I4 in- wide, and 

 nearly the tiiiik- 

 ness of the bar. 

 rounding the two 

 corners a Irille on 

 the up[)er and low- 

 er sides, that it 

 may be c a s i 1 y 

 raised and lowered. 



Two Types of Inexpensive 

 Depth Gages 



ONE of the handiest tools for all me- 

 chanics is the depth gage. One can 



easily make a gage that 

 as well as practical. 



In the illustration the 

 lower figure shows a sim- 

 ple gage made of 3^ in. 

 steel wire and a small 

 pulley key ; the measur- 

 ing rod is locked by a 

 small thumb screw. 



The upper figure is an 

 automatic locking gage 

 of steel or wood, pres- 

 sure on the split ends 

 being required to release 

 it. A small rod is split 

 "J/g of its length, and it is 

 then sprung slightly so 

 that friction is created 

 great enough to hold it 

 in place when in opera- 

 tion. — L. E. Fetter. 



s mexpensive 



L 



The upper 

 figure shows 

 an automatic 

 locking gage 

 of steel or 

 wood. The 

 lower one is 

 made of steel 

 wire and a 

 pulley key 



The flame is blown up into the pipe 

 heating it evenly for tjic entire length 



Annealing Brass Pipe 

 for Bending 



IT is usually necessary 

 in bending brass pipe 

 or tubing to first anneal it 

 to prevent the metal from 

 cracking or breaking. 



The customary way is to heat the 

 pipe at the point where the bend is to 

 l)e made Iiy applying the torch to the 

 outside of tiie [liix-, turning the pipe 

 until it is heated tlioroughly and evenly 

 all around. 



A still better method is to place the 

 pipe on an incline 

 and place the torch 

 so that tlie flame 

 is blown into the 

 end of the pipe. 

 This will heat the 

 pipe ewnly tiie full 

 Inigth, after w hich 

 it should be dipped 

 in watir. This will 

 gi\e the pipe an 

 even color over its 

 entire length. 



