Experimental Study of An Illuminometer
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This is very easily reproduced, and it is the same illum- ination as that given by the Prench standard light when fixed at a metre distance Our instrument for the purpose must be light and portable, for it had to be moved about the streets , It required to be easily repriducible at any time and ixLace, and to be absolutely uniform I took my idea from the fairy lamps EXPERIMENTAL STUDY OP AN ILLUMINOMETER used at the Savoy Theatre in "lolanthe" , Here we had something portable, uniform and very ...easily manufactured , One of these lamps was placed inside a small "box, the top of which had a screen of white paper on which was a grease spot . I was able, "by increasing or diminishing the current of electricity pro- ducing the light, t© vary the illumination of one side of this grease spot . When it was de- sired to measure the illumination of any space, such as the surface of the street, this box had simply to be put at the place to be measured, and the current had to be regulated until the grease spot disapeared , The current of electricity then became the measure of the illumination abd a simple table gave the result in terms of the new standard ." After the work of Jtr , Preece many illumi- nation photometers were designed most of which EXPERIJIEKTAL STUDY OP AIT ILLUMIITOIIETER had th«ir point of balance always fixed, the balance being determined by moving of the standard scoiirce of light, by inclining the screen, the use of mirrors or some other such device , Recently, however, two men came out with devices which are practically alike, one described in the American Gas Light Journal of August I9I6, the other described in the Lighting Journal of November I9I6 , This apparatus has a direct reading scale and is the one upon v/hich this work is based , Its details and construction are given in the following pages in which are also given the method of study of the apparatus , TJXPEHIMraTTAL STUDY OP AM ILLWIINOIIEI'ER • Construction of Illximinometer The illiuninometers as described in the American Gas Light Journal and the Lighting Joiirnal were about ten inches long with a one inch square opening running their lengths Over this opening was placed the screen, v/hich was a piece of paper treated throughout its length over a narrow strip to give that strip a waxed appearance ^ The exact treatment of the screen was not given ^ At one end of the box was placed a small tungsten lamp (about four volts) , The pxirpose of this work being to study this type of illurainometer experimentally, it was decided to build one about four times the size of those described in the Journals with the idea in view of obtaining a greater range and more accurate readings , The box built with this in view is detailed in Pig, I and shown in the illustrations of Pig's , 2 & 3 ^ Prom the dimensions of Pig , I, it can Gfound
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You can find similar books in the "Read Also" column, or choose other free books by Summerfield, Myron L to read online
To quickly assess the difficulty of the text, read a short excerpt:
This is very easily reproduced, and it is the same illum- ination as that given by the Prench standard light when fixed at a metre distance Our instrument for the purpose must be light and portable, for it had to be moved about the streets , It required to be easily repriducible at any time and ixLace, and to be absolutely uniform I took my idea from the fairy lamps EXPERIMENTAL STUDY OP AN ILLUMINOMETER used at the Savoy Theatre in "lolanthe" , Here we had something portable, uniform and very ...easily manufactured , One of these lamps was placed inside a small "box, the top of which had a screen of white paper on which was a grease spot . I was able, "by increasing or diminishing the current of electricity pro- ducing the light, t© vary the illumination of one side of this grease spot . When it was de- sired to measure the illumination of any space, such as the surface of the street, this box had simply to be put at the place to be measured, and the current had to be regulated until the grease spot disapeared , The current of electricity then became the measure of the illumination abd a simple table gave the result in terms of the new standard ." After the work of Jtr , Preece many illumi- nation photometers were designed most of which EXPERIJIEKTAL STUDY OP AIT ILLUMIITOIIETER had th«ir point of balance always fixed, the balance being determined by moving of the standard scoiirce of light, by inclining the screen, the use of mirrors or some other such device , Recently, however, two men came out with devices which are practically alike, one described in the American Gas Light Journal of August I9I6, the other described in the Lighting Journal of November I9I6 , This apparatus has a direct reading scale and is the one upon v/hich this work is based , Its details and construction are given in the following pages in which are also given the method of study of the apparatus , TJXPEHIMraTTAL STUDY OP AM ILLWIINOIIEI'ER • Construction of Illximinometer The illiuninometers as described in the American Gas Light Journal and the Lighting Joiirnal were about ten inches long with a one inch square opening running their lengths Over this opening was placed the screen, v/hich was a piece of paper treated throughout its length over a narrow strip to give that strip a waxed appearance ^ The exact treatment of the screen was not given ^ At one end of the box was placed a small tungsten lamp (about four volts) , The pxirpose of this work being to study this type of illurainometer experimentally, it was decided to build one about four times the size of those described in the Journals with the idea in view of obtaining a greater range and more accurate readings , The box built with this in view is detailed in Pig, I and shown in the illustrations of Pig's , 2 & 3 ^ Prom the dimensions of Pig , I, it can Gfound
What to read after Experimental Study of An Illuminometer?
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