January 1920.

CONTENTS

CHAPTER PAGE
I. Introductory [1]
II. The Illuminant [3]
III. Paraffin-oil Lamps, Incandescent Gas and Spirit Burners [6]
IV. The Acetylene Light [11]
V. Limelight and the Acetylene Blast [16]
VI. The Electric Light [39]
VII. The Optical System of a Lantern [57]
VIII. The Body of the Lantern [70]
IX. Lantern Boxes, Stands, Reading Lamps, etc. [76]
X. Screens and Screen Stands [79]
XI. The Practical Manipulation of a Lantern [82]

ILLUSTRATIONS

FIG. PAGE
1. Oil Lamp [6]
2. Inverted Incandescent Lamp [8]
3. Methylated Spirit Burner [9]
4. Luna Lamp [10]
5. The Moss Generator [12]
6. The A.L. or 'Popular' Model [14]
7. Acetylene Jet [15]
8. Oxygen Cylinder in hemp cover [17]
9. Double Lever Key [18]
10. Fine Adjustment Valve [19]
11. Construction of Beard's Regulator [20]
12. Beard's Regulator [21]
13. Regulator and Gauge [22]
14. Gas-bags [24]
15. 'Blow-through' Nozzles [25]
16. 'Blow-through' Jet [25]
17. Mixed Jet [27]
18. Mixed Jet, Gwyer pattern [27]
19. Mixing Chamber of Jet [28]
20. 'Injector' Jet [30]
21. 'Gridiron' Saturator [32]
22. 'Pendant' Saturator [33]
23. Fallot Air Blast [37]
24. Fallot Air Blast, and Cylinder [37]
25. Lime-tongs [39]
26. Universal Hand-fed Arc Lamp [45]
27. [46]
28. Resistance [49]
29. 'Scissors' Arc Lamp [51]
30. 'Right-angled' Arc Lamp [52]
31. 'Westminster' Arc Lamp [53]
32. Arc Lamp with Induction Ring [56]
33. The Optical System of a Lantern facing p. [57]
33A. Optical System of Lantern [57]
34. Optical System without Condenser [59]
35. Action of Condenser [59]
36. Forms of Condensers [60]
37. Double Sliding Carrier [62]
38. Beard's Dissolving Carrier [63]
39. Focussing Action of Lens [64]
40. Achromatic Lens [65]
41. Petzval Combination [66]
42. Hughes' Short-Range Lantern [71]
43. Long-Range Lantern [72]
44. Connections for a Bi-unial Lantern [73]
45. Beard's Circulating Water Tank [75]
46. Quadruple Lantern Stand [78]
47. Reading Lamp [79]
48. Roller Screen [80]
49. Portable Screen Stand [81]
50. Adjustment of the Light [84]