Show A POWERFUL L searchlight searchlights Searchlight 8 bre are conspicuous items ta in the domain of science just now and vt W to le recorded that to cur own country as aa usual belongs the bibb honor of constructing the largest and most moet powerful oue one in existence it is IP now being set act up or perhaps ty ky this time in ie in place e at the worlds fair we are furnished furnis beU with a circular descriptive of its md ind characteristics elm ae to size an idea ot 01 the s proportions may be gained from toe the picture accompanying the circular la in which a man of ordinary size raw hen but little over half way to the top opt its ita measurement being about lo 10 feet 6 inches high to the upper side aide of the ventilator ou on the top of the drum while the total weight is about too put p und indr but sao BO perfectly Is ie it mounted and balanced that a child can move it in any direction the rho reflecting lens lene mirror used in n this projector Is i centimeter centi or 60 inches in diameter it is B a concave spherical mirror of the maugle free from aberration reflecting a senal bly parallel beam of light it was waa especially tor for this projector in paris france and is a most moat perfect specimen of optical work 1 three and one fourth inches thick at the eckes and one sixteenth ef cf an inch thick at ac the center and weighs about pounds the metal in which it is mounted weighs about and the total lens ring grinj and cover weigh about 1600 this great mirror is ie mounted moun teki at one end of the big drum the outer aud of which to ie furnished with a door consisting of a metal rim in which are fixed a number of plate glass strips five sixteenths of an inch thick by six eix luchea wide inside this thia drum and sliding upon ways arrange arran goo i on the bottom is ia placed the electric lamp the he source of the light which is re fleeten fleeted by the mirror the machine is entirely automatic in its action aud and the lamp has a luminous intensity of to candles cand lec while the reflected beam bam equals cand leel this is an intensity which the mind cannot rasp grasp nor the eye appreciate it approaches approach ts more nearly the fierce luminosity of he be sun himself hin self than that of any previous mechanical device in ancient or modern times |