Popular Science Monthly 



141 



joint line run the lines up until the same 

 numbered lines cross each other. Mark 

 with crosses and connect with a curved 

 line as indicated in the illustration, and 

 the pattern is complete. 



In the development of problem Fig. 3, 

 the steps taken are exactly the same as 

 the foregoing; in fact all the problems 

 in this article and the previous one are 

 based on the same principles, the only 

 difference in method being the two new 

 steps involved in the problems in this 

 article. 



In problem Fig. 4 we have the same 

 principles and method with a little dif- 

 ferent application of one of the new 

 steps. Draw the front and end view 

 locating the joint line; develop the pat- 

 tern for the small pipe as previously 

 explained. When we come to develop 

 the hole in the large pipe we will find 

 that two extra points X — Y will be 

 needed on the bottom view to indicate 

 where point 3 of the large pipe comes 

 in contact vnth the small pipe. We 

 know that this point 3 will cause a change 

 in the pattern of the small pipe in two 

 places somewhere between points 1 and 

 2, also between 2 and 3; the exact dis- 

 tance can be found by measuring the 

 space on the large pipe. 



Proper Care of Shoes to Make Them 

 Wear Longer 



IT is possible to take such good care of 

 your shoes that they will wear twice 

 as long and look well to the last minute. 

 In the first place, buy shoes that fit 

 properly. Well fitting shoes will always 

 outlast shoes that are either too tight 

 or too loose a fit. 



Remember that patent leather shoes 

 and light weight footwear are not in- 

 tended for hard service and consequently 

 will not withstand rough wear. Be fair 

 to your shoes and do not expect of them 

 what they were never designed to give. 

 All patent leather is likely to crack and 

 no guarantee against this is made by the 

 manufacturers of shoes. When the shoes 

 are wet, be careful in drying them not 

 to place them too near the fire, as they 

 will dry out too quickly. This takes 

 the life out of the leather and destroys 

 its durability. Therefore, do not attempt 

 to dry your shoes too quickly when 



they are damp. If your shoes are cleaned 

 and dressed with proper dressing, they 

 will wear twice as long. To keep 

 them soft and pliable, there is nothing 

 better than "neatsfoot" oil, which is in- 

 expensive and can be bought at any 

 leather or harness store. This oil is not a 

 patent preparation, but is an oil that is 

 used extensively by all harness makers 

 to keep their goods in fine condition. 

 Applications of this oil, say once a week, 

 will keep the leather pliable and wear- 

 resisting. — W. S. Standiford. 



Shape of tape and man- 

 ner of attaching to glass 



Attaching a Cord to the Glass of 

 Nose Spectacles 



FOR a time I used a pair of borrowed 

 nose glasses which had no hole for a 

 cord, and fear- 

 ing they would 

 fall off and 

 break I at- 

 tached a cord 

 temporarily by 

 using a piece of 

 adhesive tape. 

 The tape was 

 cut as shown 

 and stuck to 



one glass, holding beneath it the loop of 



the cord. — James M. Kane. 



How to Engrave Your Name on Steel 

 or Iron Tools 



TO engrave your name on steel or iron 

 tools, melt some paraffin wax in a 

 tin can, old saucer or other suitable con- 

 tainer; take a brush and coat the surface 

 with the wax, then let it cool. When the 

 wax hardens, draw the design or name 

 on it with a scriber or other sharp instru- 

 ment, taking care that the sharp point of 

 the scriber goes through the wax and bites 

 or scratches the metal underneath the 

 wax. Then take a fountain-pen filler or 

 a hard wood stick whittled to a point, 

 and dip it into nitric acid, letting the 

 drops penetrate through the name or 

 design on the wax. 



Be sure to cover all of the name with 

 the acid, letting it remain on the metal 

 for about five minutes, so as to get 

 deeply-cut letters. Rinse the acid off 

 with water, and heat the metal until 

 the wax melts; then wipe it dry. 



