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1947-48 Theatre Catalog, 6th Edition, Page 158 (146)

1947-48 Theatre Catalog, 6th Edition
1947-48 Theatre Catalog
1947-48 Theatre Catalog, 6th Edition, Page 158
Page 158

1947-48 Theatre Catalog, 6th Edition, Page 158

FIGURE lS-When platforms are installed (see Figure 18). it will be necessary to provide a ramp from the level platform to meet the slope of the aisle. Platforms for patrons' comfort are u must when the difference in elevation of any two adiacent rows of seats is greater than 3 inches. With 32-inch spacing, the space allowed for the chair is 14 inches, and the platform is 18 inches wide.

painted with a cold water paint or nonbridging lacquer, and even then care must be taken that the voids are not tilled which will definitely ruin the acoustical qualities. This is also true of acoustical tiles, although some types can be painted with lead and oil without aifecting their absorption too much.

One of the most versatile materials for this purpose is the rockwool blanket, 1 inch thickness, installed on the wall with 1 inch of air space behind it, and covered with a stretched fabric or decorative effect. This material is fireproof and can be applied to the bare masonry walls, requiring no plaster on these surfaces. Such an application, in addition to acoustical correction of the auditorium, also serves as a thermal insulation of the exterior walls and cuts down heat loss in the winter and heat infiltration in the cooling season, thereby effecting a savings in fuel consumption and in electrical current necessary to produce the cooling.

Rockwool blankets are made up in many sizes and a variety of coverings, but the type which has been found most acceptable for this kind of application is 1 inch in thickness compressed to a density weighing between 10 and 12 pounds to the cubic foot, covered on both sides and edges with flame-proofed muslin, and on one side with chicken wire, with sudicientrwire ties through the blanket joining the wire and the muslin, to keep the rockwool fibres in place. These ties are very essential and should he insisted upon, as otherwise the fibres will become separated and fall to the bottom of the panel, thereby nullifying the required acoustical correction.

The standard rockwool bat as described above is 2 feet wide by 4 or 8 feet long and should be hung vertically and securely nailed to wood grounds installed on the masonry walls around the permimeter of the panels, and horizontal grounds 24 inches on center in the panels. These grounds should be 1 inch in thickness to provide the required air


space behind the rockwool and 2 inches wide for the horizontal grounds. (See Figure 20.) The horizontal grounds at the 4 foot points should be at least 3 inches wide in order to properly secure the bottom edge of the first bat and the top edge of the next one. The grounds around the perimeter of the panel whether it be rectangular or irregular in shape should be 3 inches in width with a secondary ground on the outer edge 1 inch wide and 11/8 inches thick. (See Figure 21.) The last mentioned ground is used as a tacking strip for the decorative fabric and the 11/8 inch thick ness is required so the fabric can be smoothly stretched without touching the rockwool bat.


In normal times, many fabrics suitable for wall coverings are available in almost any combination of colors, and designed at the proper scale for this purpose. They can be had in silk and cotton damasks, cotton and rayon damasks, velvets, homespuns, monks cloth and glass cloth. The materials which are woven especially for this use are 50 to 52 inches in width, with matching patterns. This is a requisite as it will be necessary to sew several widths of material together to cover the area of most panels making up this type of decorative scheme. (Attention is called here to the fact that some fabric materials are manufactured for use as window draperies, and the like, and do not match, and are not adaptable for this special use.)

It is generally required that these

fabrics be Hame-proofed, and it is good practice to have them so treated on account of safety, whether or not it is required. The flame-proofing solution may be applied to the fabric before sewing, which is the preferable method on account of shrinkage during the process in certain types of fabrics, or by sprays ing' after the material is stretched in place. If the latter method is used, a1 lowance must be made for this shrinkage when the fabric is tacked to the grounds.

Fabrics woven entirely of glass thread or a combination of glass and asbestos are just becoming available and seem to have great possibilities for theatrical use. This type of fabric, due to the materials from which it is woven, is fire-proof and easily cleaned. Up to the present time, however, this type of fabric with woven designs of any desired combination of colors is not on the market, and designs must be printed on the fabric with dyes or paints which are not too stable, and one of its great advantages of cleaning with a damp cloth is more or less discounted by the fading of the colors.

The proper installation of the fabric panels on the wall panels should be done by mechanics who are familiar with this special type of work. There are many decorating firms who specialize in this type of work including stage draperies, and it will be found a distinct advantage to use their services if available.

The large fabric panels must be stretched to just the right tension depending on the qualities of the material, as there will always be a certain amount of variation in this tension due to changes in the humidity. This will result in wrinkles one day, and perhaps pulling away from the tacking strip another time. Therefore, it is necessary that the grounds be securely attached to the masonry walls using either cut nails driven in the masonry joints or cinder block, or toggle bolts if the inner face of the masonry walls are of hollow tile. The fabric panel should then be temporarily tacked in place at the top and the pattern plumbed, using a plumb bob. The entire perimeter of the panel is then tacked to the grounds with 3-ounce tacks, 11/2 to 2 inches apart. If fabric is in large panels where several widths of material are sewn together, additional tacking is required on either side of the seams. The tacks should be then covered with a fabric guimpe strip, tacked and glued, or by a narrow wood mould.


If the auditorium is to be the stadium type, the entrance to both the stadium and orchestra will, in most cases, be through a vomitory or vomitories from the lobby or foyer. These vomitories will empty into a cross aisle separating the orchestra seats from the stadium seats, With stepping adjacent to vomitories, leading to the stadium seating. These steppings will connect with the stadium aisles.

Due to the fact that this cross aisle will carry all of the incoming and outgoing traiiic, it should be at least 5 feet wide, and increased in proportion to the number of seats in the house. There should be a solid rail, similar to a regular standee rail, immediately behind the last row of orchestra seats, and a solid rail forming the facia of the stadium.

The location of this cross aisle will be governed greatly by the general plan but should be so located as to permit the greatest number of seats possible in the orchestra section Where they will produce the greatest revenue.

In some instances it will be expedient to install a cross aisle in the stadium

1947-48 Theatre Catalog, 6th Edition, Page 158