The Moving Picture World (April 1907)

86 THE MOVING PICTURE WORLD. for general work, but a safe rule is not to use a lens which is shorter in focus than the diagonal of the plate you wish to cover. The mind is frequently confused regarding the angle view of lenses. The fact that a wide lens will cut a larger angle with a small stop is often deceptive. It is thought that the angle will increase over the same size plate. This is not true, however, as the angle on a certain size plate varies entirely with the focus of the lens, and diaphragming will not affect the focal length of a good lens in any way. It is simply necessary to use a larger plate if we wish to increase the angle and still use the same lens. Again, the angle of view is sometimes mistaken for the circle of illumination. The circle of illumination is merely the limit of the field of the lens which is formed by the extreme rays of light not cut off by the lens mounting. Angle of view refers to the greatest area which is sharply defined and which will produce a clear and dis- tinct image on the plate. - ■ " - Angular aperture and angle of view are also vastly different. The angle of the aperture is the angle formed at the focus of the lens by the extreme rays passing through the largest diaphragm opening, while the angle view is the angle formed by the optical center of the lens by the extreme rays producing the image on the plate. Both are easily measured by diagraming. Figure 3 illustrates how the angle of any lens may be ascertained by simply knowing the focus of the lens and the diagonal of the plate. These can be measured prac- tically with an ordinary rule. In conclusion it is well to observe that the mysteries of a photographic lens are not nearly so deep as pictured and that a little spare time devoted to study of the prin- ciples of light will help one considerably toward obtaining good results and the discarding of a lot of useless and bulky apparatus. {To be continued.) Charles H. Thompson, the well-known adjuster and circus man, has closed a deal and disposed of his theatre, "The Palace," at Montreal, Can., at a good figure to local parties. Mr. Thompson will go to Norfolk for the summer. The new proprietor is Mr. J. A. Simard, of Montreal. The house still remains Under the manage- ment of J. Jefferson Brott with the same house staff. We learn that Chutes Amusement Company, Shelly County, Tenn., has been formed with a capital of $10,000, and that moving pictures will be operated by them. * * * We glean information from St. John, N. B., as follows: The English Cineograph Company have a splendid selec- tion of high-class moving picture films for their exhibi- tion in the Opera House, starting Wednesday, April-14. * * * A correspondent in Warren, 1 O., tells us that Messrs. Draber & Guarnieri will take a room in the Wagstaff building for a moving picture show to be opened about the 10th of April. * * * At Asheville, N. C, on Tuesday, April 2, J. O. Her- rington, manager, opened the "Nickelo," a high-class moving picture theatre, at No. 46 South Main street The place will be open from 11 a. m. to 11 p. m. * * * Rutland, Vt., is to have a nickel theatre, a license hav- ing been granted for one at a fee of $50. It will be in the store owned by George T. Chaffee. Moving pictures and illustrated songs make up the entertainment, twenty- minute performances.being given throughout the day. * * * Sword & Rydell, of Philadelphia, opened a moving pic- ture parlor, in Liberty Square, Portchester, N. Y., and will show pictures that come from all parts of the world, all of them up-to-date. The pictures will interest both old and young. The program is changed on Mondays, Wednesdays and Fridays. Admission, 5 cents. * * * Wonderland, a new moving picture and illustrated song theatre for Adams, Mass., was opened in the Mausert block recently. The place has been fitted up to com- fortably seat 125 people. The entertainments will con- sist of moving pictures and illustrated songs. Afternoon and evening performances will be given. * * * From Buffalo, N. Y., comes the following: Incorpora- tion papers of the Saturn Amusement Company were filed in the County Gerk's. office, March 30. The company, which will manufacture-amusement devices, is capitalized at $20,000. Business will be started with $5,000. The directors are Demase J. Cadotte, Louis J. Voltz and Harry A. Alien.