A Curious 



Clock Built 

 Principle 



IN this very interesliiig clock the 

 time is recorded on a parchment 

 strip five-eighths of an inch wide and 

 eighteen inches long, from 

 the ball is suspen- 

 ded. The time is in- 

 dicated by a figure 

 of Father Time 

 placed at the edge, 

 his fingers pointing 

 to the hour. No 

 mainspring driv-es 

 the' clock, the 

 motive power being 

 supplied by the 

 vtotal weight in the 

 moving ball and 

 Father Time. A 

 le\-er controls the 

 mo\cment. 



As soon as the 

 ball is suspended 

 the clock begins to 

 go and continues to 

 go until the eigh- 

 teen inches of 

 parchment have 

 been unwound, at 

 the end of thirty 

 hours. To rewind 

 the clock, the ball is 

 simply lifted up to 

 whatever the time 

 may be. If lifted 

 too far it can be 

 pulled down. It does 

 is kept in position by 

 A small mainspring winds 



A Heat-Resisting 

 Socket for High 

 Wattage Lamps 



TH E tremen- 

 dous wattage 

 necessary for the 

 high candle-power 

 lamps now so gen- 

 erally used, has put 

 the illuminating 

 engineer to the task 

 of devising a socket 

 capable of "stand- 

 ing up" under the 

 intense heat which 



Popular Science Monthly 

 on a New ^f^ 



511 



is consequently generated in them. 

 The cost efiiciency of high-light 

 units has created an increasing de- 

 mand for lamps of large candle-power. 

 With the increased wattage there has 

 developed a corresponding percent- 

 age of breakdown 

 in lamps and sock- 

 ets which is due to 

 the intense heat 

 developed. 



The socket 

 shown in the illus- 

 tration at the 

 bottom of the page 

 is larger than the 

 usual lamp recep- 

 tacle, with a casing 

 built especially 

 strong to with- 

 stand almost any 

 kind of rough 

 usage. 



The conducting 

 paths are insulated 

 and sealed with a 

 compound said to 

 be capable of with- 

 standing any heat 

 to which it is likely 

 to be subjected in 

 service. 



Father Time points with his finger to the 

 hour and the clock has no need for any 

 other "hands" to designate the exact time 



not drop for it 



a friction spring. 



up the strip. 



I 



F WE count 

 America and 

 eems to - dav, 



The socket is larger than the usual recep- 

 tacle for the lamps and has a strong casing 



The Money Value 



of Two Great 



Discoveries 



the wealth of North 

 South America as it 

 we find that the dis- 

 covery of America 

 by Christopher 

 Columbus has 

 been worth to the 

 world three million 

 dollars a day from 

 the time he sailed 

 from P a 1 o s in 

 August, 1492, down 

 to the present time. 

 Likewise the man 

 who discovered the 

 way of drawing 

 tungsten wire gave 

 three huntlred mil- 

 lion dollars' worth 

 of light yearly. 



