. Marine Engineer . .. in ik. pori oi thi carboi ...veil as tl 1 I i] case the 6 ..1. lamp burns with 1 1 ir to the ordi 11, the makei alts which give the . 1. 1 , 1 he lamp ha and idvanl h hii i. \ be oi mii 11 iven 1 penditu electrii itei than .mi!, the ordinal y ariif tl ilts witl, .... nati ipon the light anothei ro] tain casi rhi li ;hi giv< n .?in.,, the ? oloi fhi i is pei ha] i ? tani e in ;i ,1 ,, , certain kinds of cargo. White light, it will be rememberedis made up of the whole of the colours of the rainbow incertain proportions. All forms of artificial light are alsoma
. Marine Engineer . .. in ik. pori oi thi carboi ...veil as tl 1 I i] case the 6 ..1. lamp burns with 1 1 ir to the ordi 11, the makei alts which give the . 1. 1 , 1 he lamp ha and idvanl h hii i. \ be oi mii 11 iven 1 penditu electrii itei than .mi!, the ordinal y ariif tl ilts witl, .... nati ipon the light anothei ro] tain casi rhi li ;hi giv< n .?in.,, the ? oloi fhi i is pei ha] i ? tani e in ;i ,1 ,, , certain kinds of cargo. White light, it will be rememberedis made up of the whole of the colours of the rainbow incertain proportions. All forms of artificial light are alsomade up of lights of different colours, blended together, butthe proportions of the different colours are rarelv the same asin sunlight. Nearly all forms of light are particularly richin red light, the exceptions being the mercury vapour lampthat has recently been put on the market, and some formsof flame arc lamps. Where the light is rich in red rays,some of the colours show quite differently from their colours. Search-light Apparatus, made by Messrs | |[ Holmes & Co.,Newcastle-on-j in sunlight, deep purples, foi instance, show i 11 .., with the mercury vapour lamp-, which 11. 1, in \ .. ill 1 .mil have hardl) anj red, the pinks showblack 1 h. present writer has tested every lorm oi lightthat I . introduced, and he ha onlj found the flame arc true, and that only when salts of sodium are used forimpn ic I illustration tiov arch light app ira- tus made 1 iy Me rs. J ll 1loll ! Co oi New astle 0 1Tyne. February i. 1908. THE MARINE ENGINEER AND NAVAL ARCHITECT. 295 JAMES WATT ANNIVERSARY. Till anniversary ol the birth of fames Watt has, asusua - elebrated by the people ot Greenock— the town of Watts nativity and by the engineering and shipbuilding community ot the ( lyde and the West ofScotland as represented by the [nstitution of Engineersand Shipbuilders in Scotland. The observance in the caseof Greenock took the foim ot the customary Watt lectureby a man
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