ELECTRIC LIGHTING

Otago Daily Times, Issue 16782, 25 August 1916, Page 3

ELECTRIC LIGHTING

MIME liYl ERESTIAI! INFORMA'IION'

Before a nipf' ng ol' the Ol.igo bianili oi the Nou '/iv iland lustituto c.l -ViTliiti'i'ts on Widiiewliiv t'u.imj, Air I l ' K. Shepheid ui'lim tul ;in .nit lestiug and mlouiiativ o li.ipt'r on Mm .suoju't 01 oleitue lighting. in the oourbc ol ins addio-i Air ishopHeid tout hid upon tlio Listing ol electm itj , showing tii.it til lb lotec was Known .is i-.irly as 10UU. Coming down to modiru tunes, lie "tat. d tli.it about the middle ot lho NineiLfiitii Ccnt'irv Edison, 111 Amenta .md .Siwin, in Engl mil, nivemed the iiii'.iudc.sc.ciit lamp, ,md atteiivaid. icu.limit d into the one umipaiiv. Agu it advanie had been made in t.ii tun ttu> lion ot tin,-so Limps, .mil in plaio ol tlit- iMibon Limp, which used Iroin -t'M n lo 10 watts pt i candle power, we nini hid Iho ».is lultil metallic filament Liniii, which leqiiiii'd halt a watt pi'r candlepou or, .jnd which \\<is extremely economical m tin' c iso of high-powered lights. 'iho spc-.ilur next dealt with tho ellicts ot exposed or imshathd brilliant ehctne lights upo.i tho evcsight He cited the ease ot .i lacUiry where tho output w.'ts diminished !>> frufti 12 per cent. to 20 i>cr 'ent during lho horn's when artificial light was used, ulnle in tlio case ol another lactoiy tho earnings showed an merino ot 11.4 per ccnt. after tlie instillation of a better bjslem. J here could bo really no question that iiout a oointuercial |ioint of new goo<l illuuinia lion m lactones wnb worth paying fot. Ditticulliis m tlio use ot elietrio light, wluelt was only bad v.'hen it moused, wore overcome by the modern s>ston of mil.i eel. lighting The principle of this method was to contain light m a gla.is iioul and to dilluso lb through the so that most ol it was l effected up to the. eeiling of the room ami clown again. Naked light j m thop windows defeated their own oojcct it thev wcro too blight, as half the ...mount ot light, if propoily diffused, would show tho goods to better advantage. With tho present prieo of light, consumers could aflorcl to shado their globes even at the expense of c-andle-povvei. Tho ketuier, however, dill not reiximmend deeply eolouied shades, and went on to point out that plain or ettheil glass ams cjuite as effective, while if aLsoibed much le-s light. Prismatic glass was ono of tho best rtlWtois on tho market, and it served as a dilhi-ir ot light. A gteat deal moro light was reflected from light-coloured walls than from dark ones, and the average amount of light r.-tlected varied fiom SO per cent m the case ot white paper, down to 10 per cent, in tho case of dark brown. The speaker concluded with a reference to negligent or careless >\oikmanslup ill lcspcct ti> installations, and stated that offenders in this matter should bo tieated with the same severity as a person found guilty of arson. 'lho locturo wits followed by an exhibition of samples of faulty wiring ami i\>. r ietivo workmanship and materials, taken <J the lecturer himself fiom installations) Uat he had inspected, wh.oh showed only too clearly the need of expert supervision in ihc.-o matters. One or two of thes» examples showed that ordinary bell wire had toen used where proper lighting wire w.ls specified The result would have been a serious lire sooner or later. A hearty vote of thanks was accorded to Air Shepherd for the trouble he had gone t-o in preparing his valuable paper.