604 



Popular Science Monthly 



Drawing Outlines for Forming 

 Scrolls on Ionic Capitals 



THE secret of the beautiful curves of 

 Ionic architecture is said to be trace- 

 able to a seashell. 



The skillful artist 

 fastened a string to the 

 stylus and then wound 

 it about the shell from 

 the top to the bottom. 

 The shell used was in 

 the form of a top with 

 a spiral groove running 

 down its side. The point was placed 

 in the center of the proposed scroll and the 

 mark was made with the stylus, pulling 

 at the same time on the string, which 

 gradually unwound from the shell and 

 released an ever lengthening radius for 

 the stylus to work in. This produced a 



The method employed in forming Ionic scroll- 

 curves with the aid of a periwinkle seashell 



scroll with an accurate and beautiful 

 curve. Various types of scrolls were 

 produced, according to the size and shape 

 of the shell. — Harold V. Walsh. 



Marking Date of Repairs on Auto- 

 mobile Tires 



HOW can I mark my repair work for 

 future identification? This is an oft- 

 repeated question that comes from repair- 

 men who have tried many systems. Here 

 is a scheme that has been found very effi- 

 cient: A tin strip, J^ in. wide and just long 

 enough to make the necessary figures, is 

 stamped by a machine that punches the 



letters in backwards. This strip is placed 

 against the uncured rubber, with the em- 

 bossed side of the tin turned out. When 

 the job is cured the tin strip is peeled ofif 

 and the rubber is found to have been forced 

 into the little grooves of the letters, forming 

 a perfect mark. The average repairman 

 might find such a punching machine a little 

 too expensive for his requirements, but by 

 providing himself with a set of letter 

 punches, which as a general rule are inex- 

 pensive, with a hammer he could make a 

 few of his own strips. 



Probably the best place to mark a tire 

 repair job is close to the bead. The re- 

 pairman might save labor if he punched his 

 initials on a separate strip, for then strips 

 with just the dates could be made up each 

 morning as needed. 



Re- Shellacking a Cork- Float on an 

 Automobile Engine 



WHEN re-shellacking the cork-float of a 

 carbureter it should be first carefully 

 sandpapered to remove all particles of the 

 old shellac. If this caution is not observed, 

 additional weight will be added to the float 

 which will necessitate a readjustment of 

 the carbureter. This may seem unimpor- 

 tant, but it will result in trouble when 

 starting the engine. A very slight change 

 in the weight will cause considerable differ- 

 ence in the amount of gasoline admitted 

 and unless the reason is known it is hard 

 to locate the trouble. 



Tea Kettle with Whistle in Spout 

 for a Signal 



THIS kettle has no detachable top but it 

 is provided with a generous spout 

 through which it is filled and emptied. 

 Attached to the 

 handle by a 

 chain is a small 

 signal whistle 

 which is slipped 

 into the spout 

 to announce the 

 boiling point. 

 There is possi- 

 bility of a small 

 fuel economy 

 due to the scarc- 

 ity of vents and 



Tea kettle which is filled 

 and emptied through spout 



the undoubted advantageof having no cover 

 to slip ofif during the pouring operation. 



