. Popular electricity magazine in plain English. ake good. You will get only theconsideration you earn. Its up to youwhether I advance you beyond a roust-abouts job. You will find the newwatchman waiting for you in the otherroom. Good-night. A GRAVITY CLOCK The gravity clock, as its name indi-cates, is operated by the force of otherclocks, it has nosprings; theusual motorforce being re-placed by theweight of thetimepiece it-self, which slidesbetween t w overtical mechanismbeing perfectlyadjusted to theweight, the de-scent proceedswith absoluteregularity and The Clock
. Popular electricity magazine in plain English. ake good. You will get only theconsideration you earn. Its up to youwhether I advance you beyond a roust-abouts job. You will find the newwatchman waiting for you in the otherroom. Good-night. A GRAVITY CLOCK The gravity clock, as its name indi-cates, is operated by the force of otherclocks, it has nosprings; theusual motorforce being re-placed by theweight of thetimepiece it-self, which slidesbetween t w overtical mechanismbeing perfectlyadjusted to theweight, the de-scent proceedswith absoluteregularity and The Clock Itself is the Weight Precisi°n It re- quires sevendays to complete the distance from thehighest point to the lowest, so that allthe care it requires is to raise it once aweek. Having no springs, which arc affectedby temperature, nor complicated mech-anism to become deranged, this clocknever varies in consequence of changeof weather and needs no attentionbeyond the weekly necessary adjust-ment. It is a French invention, manufac-tured in IVORY—REAL AND FALSE The supply of ivory is never equal tothe demand. Hence it is that the in-genuity of man is constantly beingexercised to provide good, serviceablesubstitutes for the real thing;. Theimitations and substitutes are some-times so excellent that it is difficult todistinguish them from the genuine the expert, however, it is an easy mat-ter to tell the real from the ivory, being a modification ofdentine, shows in transverse sectionslines of varying .shades running in arcsand forming minute lozenge shapedspaces. These markings, which exist inevery portion of any transverse section,enable the expert to recognize true ivoryas distinct from every other kind oftooth substance, and from bone and allfictitious ivories. A very curious form of imitation ivoryof the vegetable sort is that which is theproduct of a plant called the Phytelephasmacrocarpa, native to South is said more complete
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectelectri, bookyear1912
