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54 CLASS 3 — Popular Science, Useful Arts and Natural History
REEL NO. TITLE PROnUCER
ings which clearly indicate the method of their detonation. The first is operated by water pressure entering orifices in the shell of the bomb, as the bomb sinks to greater depth. When it reaches the depth for which it is adjusted to explode the pressure releases a firing pin which fires a detonator and that in turn explodes the main charge. The submarine cannot stand the extra pressure caused by the explosion and collapses.
The second type is the aeroplane depth bomb, which is used by aeroplanes sighting submarines below the surface and is dropped from a height. This is equipped to explode a detonator as it hits the surface of the water and this in turn lights a time fuse which explodes the main charge when the proper depth is reached.
424 feet standard length — on same reel zi.nth 7043, Bobby Bumps at the Circus
Rental $1.25
3036 Code FAFER Gem Cutting and Polishing Bray
An industry that has prevailed through 5,000 years. Most gems are of crystalline form and found imbedded in surrounding rock. The subdivision of large semi-precious stones is featured by means of a metal disc like a circular saw with the cutting edge faced with diamond dust imbedded therein. Next, these smaller subdivisions of the original mass are roughly ground to shape on carborundum discs. The stones to be cut are imbedded in a handle which is in turn supported at one end against a post and held at the other end by the hand of the lapidary who is doing the cutting. The final polishing gives the gem its brilliance and lustre. The cutting of the facets is a particularly difficult job, in which the workmen come very near perfection. 345 feet standard length — on same reel zvith 7037, Otto Luck to the Rescue
Rental $1.00
3037 Code FAFIR Einstein's Theory of Relativity Independent Popular version, condensed from the longer Fadman production by Max
Fleischer.
An extremely interesting and simple exposition of the elementary theory of Einstein, beginning with the definition of Relativity and then proceeding by very simple and well known examples, showing the Relativity of Motion, Direction, Size, Speed, Time and Measurements. These are illustrated both by animated diagrams and by ordinary cinematography, whichever best serves the purpose desired. No attempt is made to demonstrate the more advanced ideas in Einstein's Theory, but a fair working knowledge of the principles involved is clearly portrayed and easily understood.
1,961 feet standard length — on 2 reels Rental $2.50
3039 Code FAFUR Experiments in Crystallization Bray
Showing the beautiful eflFect of crystallization from chemical solutions under the microscope. The first subject is Salicin. A large number of crystals of this solution are shown under different conditions. Following are experiments with .Ammonium Chloride and finally Sulphate of Zinc. The efflorescent effect of these chemical solutions under the microscope is quite like the growth of flowers. 366 feet standard length — with 7040, Bobby Bumps and the Hypnotic Eye
Rental $1.00
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