. Popular electricity magazine in plain English. t in the path of the this arrangement it is found that thegreatest voltage that the lamps will stand may besent through them without injury, on account of POPULAR ELECTRICITY and the WORLDS ADVANCE 1219 the extremely short duration of the current ineach one. The speed of rotation and the numberof lamps should be so regulated that a continuouslight impression is produced upon the eye andthat each lamp may have time enough to resumeits original condition before being Dussaud states that with 50 and 180 amperesapplied
. Popular electricity magazine in plain English. t in the path of the this arrangement it is found that thegreatest voltage that the lamps will stand may besent through them without injury, on account of POPULAR ELECTRICITY and the WORLDS ADVANCE 1219 the extremely short duration of the current ineach one. The speed of rotation and the numberof lamps should be so regulated that a continuouslight impression is produced upon the eye andthat each lamp may have time enough to resumeits original condition before being Dussaud states that with 50 and 180 amperesapplied to sixteen lamps of 25 and 80 candle-power respectively he has produced cold light of250 and 800 candles for several consecutive value of this new idea in cinematographylies in the fact that inflammable films may nowbe used in ways which have heretofore been im-possible, and that for many purposes an electro-generative apparatus so small that it can becarried in the hand will be sufficient.—Translatedfrom La Nature by J. H. Finding Height of Pole chance for underestimating this, or of askingfor a 35 foot pole where a 30 foot pole wouldserve. The Matthews Teleheight is a little instrumentdesigned to get the exact height of the polenecessary, and to add five feet to this on thereading of the scale. In using it, the linemanmeasures with a tape a distance of 75 feet fromthe point directly under the object which it isdesired to cross. From this distance he sightsthrough the peck hole in the Teleheight at thetop of the tree or obstruction. By turning a thumb screw at the side, he rotates a spirit leveluntil its bubble is seen crossing the line throughwhich he has sighted the top of the object. Apointer on the scale then indicates the exactheight of the pole necessary to clear the objectfive feet and allows for the proper depth of thehole according to specifications of the NationalElectric Light Association. The scale has arange covering 25 foot poles up to and i
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectelectri, bookyear1912
