Category: Engineering & Technology
My father, unfortunately, met his death in a railway accident in 1905, and the corrections and additions to the last edition, which had been to a certain extent prepared by him, were completed and written by myself, and the work as published then was again reprinted in 1911.
The illumination possible with this light is almost unlimited, and for really large halls it is, as remarked before, the _only_ substitute for the electric arc. It consists esse...
7. CHAPTER VIThe electric current provides _the_ light for an optical lantern, though it may take various forms, such as the incandescent glow-lamp in some shape or other, the comparatively...
8. CHAPTER VIIAs previously noted, the essential parts of an Optical Lantern are, in order from rear to front: (1) The illuminant; (2) the condenser; (3) the slide and slide stage; (4) the ob...
12. CHAPTER XIHaving now described the optical lantern in its various forms and the more important accessories, we come to the question of practical manipulation. In making arrangements for a...
9. CHAPTER VIIIWe now come to the mechanical construction of the optical lantern, and a great variety of design presents itself, according to price, type (_i.e._ short range or long range), an...
5. CHAPTER IVThere is no doubt that at present acetylene holds second place to electric light in popularity for optical lantern work. The light is good; not, it is true, _so_ good as limelig...
4. CHAPTER IIIThere are several varieties of oil lamps on the market, but in practically every case they take the same general form, a metal reservoir sliding in grooves in the lantern body a...
10. CHAPTER IXHaving now discussed all the essential parts of a lantern, the next points to be considered are those of lantern boxes and stands. It is best to take these together, as more oft...
3. CHAPTER IIThe first necessity for lantern projection is a strong light, and this can be obtained from a variety of sources, the principal means in common use being approximately in order...
1. PART IMy father, unfortunately, met his death in a railway accident in 1905, and the corrections and additions to the last edition, which had been to a certain extent prepared by him,...
2. CHAPTER ILantern Projection, as commonly understood, may be broadly subdivided into two branches: (A) The Projection of Lantern Slides, and (B) The Projection of Scientific Phenomena, Op...
11. CHAPTER XThe best of all screens for lantern purposes is undoubtedly a smooth whitewashed wall, and this is now provided in many halls where lantern exhibitions are usual. In places wher...