Page:Popular Science Monthly Volume 89.djvu/525

 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.

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