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1948-49 Theatre Catalog, 7th Edition, Page 357 (344)

1948-49 Theatre Catalog, 7th Edition
1948-49 Theatre Catalog
1948-49 Theatre Catalog, 7th Edition, Page 357
Page 357

1948-49 Theatre Catalog, 7th Edition, Page 357

THE CURVATURE that provides the greatest number of good viewing angles may be seen at top in the auditorium 01 the Picwood, Los Angeles. California. One method 0! staggering choirs has been used in the Magnolia. Seattle, Washington, to minimize distortion areas. At bottom is an arrangement oi theatre chairs with a reverse slope iloor in the Miami. Miami, Florida. All are Kroehler Push-Buck Chairs.

that sight lines can be improved while maintaining the existing floor slope.

Floor Slopes

There are times when 'the design conditions call for an all downward slope, while in other instances a floor slope having an upward as well as a downward slope is desirable. In such a case, a careful study of the screen position must be made so that the downward viewing angles from the balcony, and the upward viewing angles from the main floor seats are balanced out to create the most comfortable viewing angles for the greatest number of seats. It has been found that a variation in the back to back spacing, for example-32" minimum for the front rows, 33" spacing in the center of the house, with 34" for the rear rows, helps to reduce the overall slope and still gives good sight lines. The average back to back spacing used today is 34". This gives comfortable seating, and where the ttpush-back" feature is used it results in a passing clearance equal to 40" back to back spacing and eliminates the need for a seated person to stand to allow others to pass in or out of the row. At least 40" spacing is required to eliminate the need for patrons to stand to allow others to pass. To use this 40" spacing for the average theatre would mean the loss of approximately 25% of the seating capacity. The use of retractable chairs is the solution for limited spacing and at the same time it eliminates the inconvenience caused by standing patrons as well as those passing through the row.

It must be kept in mind, when designing a theatre floor, that the chair legs or standards are made to lit fioor slopes in increments of 1,4" per foot, starting at level, to a slope of 2" per foot. Maximum recommended downward slope of 11/2" with 34$ per foot for the upward slope. The best seating comfort will result when the floor is designed in this incline range. It will give a slightly greater total pitch in the iioor than required but it will be on the safer side in seating comfort and in viewing comfort.

The possibility of having seating depths of as much as forty-four rows, all on one floor, because of the ability to see the enlarged screen from such a distance, has created the need for a departure from the conventional downward slope. The all downward slope, in such instances, would become excessive and would present difficulties in meeting grade conditions. The ability to make floors generally hatter to meet these conditions, has been made possible by the positive, careful seat staggering now developed and tested, and the flexibility in floor slope treatment which takes advantage of the fact that the screen is a movable element in the vertical plane, plus the fact that the spacing also can be varied to give greater sight line clearances.

Two Simple Methods

There are two methods for solving the problem of sight line clearances-egraphs ical and mathematical. The graphical method requires careful and accurate drafting, while the other involves some

1948-49 Theatre Catalog, 7th Edition, Page 357