Handy man's workshop and laboratory . , thoseparts within and under thegoblet being left intact. Thedivisions should be carefullygone over and examined tosee that they are all perfectand of sufficient width to in-sure a good bright spark ateach break when the currentfrom a Wimshurst machineis passed through the is led into the stripthrough binding posts at-tached respectively to thesupporting spindle of thewhirling table, and to thefoot of a vertical conductingstandard formed of brasstubing, rising from the baseof the apparatus at some dis-tance from the goblet. The, curyed upper
Handy man's workshop and laboratory . , thoseparts within and under thegoblet being left intact. Thedivisions should be carefullygone over and examined tosee that they are all perfectand of sufficient width to in-sure a good bright spark ateach break when the currentfrom a Wimshurst machineis passed through the is led into the stripthrough binding posts at-tached respectively to thesupporting spindle of thewhirling table, and to thefoot of a vertical conductingstandard formed of brasstubing, rising from the baseof the apparatus at some dis-tance from the goblet. The, curyed upper part of thestandard, formed of thickwire, is made removable toallow of changing the object to be exhibited, one end fittinginto the brass tube, the other terminating in a fine, straight,stiff wire that extends down inside of the goblet, nearly touch-ing the end of the tinfoil strip. A piece of glass tubing coversthe lower part of the standard for purposes of insulation. Whenthe glass is whirled rapidly with the static discharge pass-. Fig. 201 —Luminous goblet HANDY MAN S WORKSHOP AND LABORATORY 24I ing over it in a darkened room, the effect is one of exceedingbeauty. Surrounding objects and even the substance of the gobletitself are invisible. Nothing is seen but the brilliantly luminousstrip, multiplied many times by persistence of vision, and seemingto cover the whole glass at once, studding it most beautifully allover with innumerable jewels of sparkling light. Some idea ofthe general aspect of the experiment may be gained from The ornamentalirregularity seen aroundthe periphery of the footof the goblet is obtainedby cutting out of thatportion of the tinfoil fol-lowing the edge a sec-tion about }i of an inchlong, producing at thispoint a spark longer andbrighter than the same might be donewith the upper rim ifdesired. Should it bedesirable to producethese results on a largerscale, such objects as fishglobes, show domes,large bottles, etc., maybe used,
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Keywords: ., book, bookcentury1900, bookdecade1910, booksubjectworkshoprecipes
