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100 NEWTON & CO., Ltd., Lantern Slide Publishers. UT ;-A BRIGHT-LINE SPECTRA. The following speoial slides were designed to show on the screen the bright-line speotra in correct colourt of the various gases and metals. They were first made for the lata Prof. Sir William Ramsay to illustrate his lectnre before the British Association. Wears anxious to acknowledge the kindness of the late Prof. Sir Wnxuu Rahsjlt, P.R.8., die., who, in Bpite of the great demands on his moBt valuable time, with his usual oouiterj, most kindly assisted us in the production of these Slides. TheBe can only be shown in conjunction with No. 1 of this series, whioh is used with each of the others in turn. • Price, No. 1, 10s. *, ail the remainder Si- each. 1 Bpectrnm slide, colour- ed, to be pieced in sn ordinary single lantern with any of the following:— & Helium Line Speatrnm i Argon „ n 4 Noon T.ine Speatinm 6 Krypton ,, „ 6 lemon „ „ 7 Hydrogen,, „ 8 Oxygen „ ,, 9 Nitrogen „ ,, 10 Caloinm Line Bpeokrum 11 Strontium,, „ 13 Barylam „ „ IS Indium „ „ 14 Natriam „ „ 15 Lithium „ „ 16 Kallnm Line Bpeotxnm 17 Rubidium „ IB Casinm „ „ 19 Titan „ „ 20 Radium „ „ 31 Emanations of Radium The abovBBeries of Slides on Bright-Line Spectra was so well received and proved so useful that, by the request of some of our customers, we went to considerable trouble and expense to add the characteristic spectra of 33 more substances. Air. Aluminium. Ammonia, Arsenic. Bismuth. Bromine. Calcium Chloride. Carbon. Carbon Hydride, II Carbon Oxide. 13 Chlorine. IS Chlorophyll. 14 Copper. Si Cyanogen. II Cold. 17' Iodine. M Iron. 19 Lead. 40 Magnesium. 41 Manganese. 43 Mercury U Nickel. 44 Oxide ol Nitrogen. 45 Phosphorus. 46 Plulnum. 47 Silicon. 48 Silver, as Sulphur. 6U Thorium. SI Tin. S3 Uranium. 53 Water. 54 Zinc. Bee also page 125 -1 1 AFK REFRACTION OF LIGHT. Plain Slidet, 2# 6 d. each. 1 Photograph of Mirage on hot City Pavement I Parallel Bundle ol Rays coming to successive foci 3 Light Ray travelling in line curve in non-homo- I In non-homogeneous medium geneous medium I AFL ANOMALOUS'DISPERSION OF SODIUM VAPOUR. t Sodium Flame (Coloured), 6*. I 8 Spectrum given by prism of Sodium Vapour crowed 2 Spectrum given by prism of Sodium Vapour I by diffraction grating, it. 6 d. crossed with a glass prism (col'Ured). 6*.