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1945 Theatre Catalog, 4th Edition, Page 164 (142)

1945 Theatre Catalog, 4th Edition
1945 Theatre Catalog
1945 Theatre Catalog, 4th Edition, Page 164
Page 164

1945 Theatre Catalog, 4th Edition, Page 164

Sound Control

Lead is an effective material for use in the control of sound. In the construction of sound-proof radio control rooms, which are sometimes part of a modern theatreis equipment, lead may be used as an absorbing material in the walls and doors. Broadcasting studios often rest entire rooms on pads of lead as well as line the walls and ceilings with sheet lead. Lead-lined sound-proof doors are stock items of door manufacturers.

More common problems of sound and noise control include the damping of machinery vibrations. A very successful vibration isolation pad for use under machinery such as refrigeration compressors consists of a sheet lead envelope enclosing two sheets of asbestos millboard separated by a thin sheet of steel. Pads of this type will stand very heavy loads and will sharply reduce the amount of vibration transmitted to the building.

The very property of lead that makes it suitable for suppressing unwanted noises makes it ideal for use in producing desirable sounds. Because lead does not respond to vibration, it is the best metal for use in organ pipes. Many of the speaking pipes of an organ are made of lead alloy which, being nonevibrating, does not respond to the sound vibration produced by the mouth of the pipe or the reed, as the case may be. This is very important because each range of pipes is voiced to produce a certain combination of tones and overtones and the production of a single additional vibration would alter the characteristics of the voice.


Probably no other type of building requires more fastenings for securing furniture and equipment in place than does a theatre. The seating alone calls for thousands of bolts to be securely set in concrete fioors. Projection machines and their auxiliaries, ventilating equipment,

LEAD, AS A SOUND-PROOFING MATERIAL, has developed tremendously since the advent of modern radio studios. Because lead does not vibrate, as do other metals, it is a most efficient sound deadener.


FOR THE CAMES IN STAINED GLASS WINDOWS, lead realizes its classic use in decoration. Whereas in the older decorations of this type, lead merely held the units together, modern craftsmen, as is shown in this Lead Industries Association photograph, use lead as an integral part of the design. This door panel, with the central medallion surface modeled, was designed and fabricated by D'Ascenzo Studios of Philadelphia.

exit lights and many other special features must be made fast to walls and floors. For this purpose there is no more adaptable or more economical fastening than the lead cinch bolt or lead calked anchor bolt. There are many types of bolts of this character on the market, many of them of patented design sold under trade names. However, they all operate on the same general principle of expanding a soft lead ring over a tapered bolt head or nut, either by screw pressure or calking. The smaller type most often used for fastening seating to the iioor, consists of a bolt with a tapered head assembled complete with a soft lead sleeve. To provide a firm anchor it is necessary only to insert the assembly into a properly sized hole drilled in concrete or stone and strike a few blows on a tubular calking tool slipped over the threaded end of the bolt.


Another lead product which is often used for fastening two materials together is a cement made of litharge (an oxide of lead) and glycerine. This cement is

not used as a glue but rather as a grout,

for instance where a metal part is to be fastened into a hole drilled in marble or where glass is to be set in a metal channel. This cement must be used soon after being mixed and it will quickly harden to produce a hard water-proof joint.

Battery Plates

One more utilitarian use should be mentioned, and that is storage batteries, which are often provided as a means of emergency lighting in case of power failure. Such lighting might be the means of saving hundreds of lives by averting panic in case of interruption of electric service.


So far, we have considered only the purely utilitarian uses of lead in its applications to the theatre and, while that list is not complete, some space must be saved for the decorative and ornamental uses.


Red lead Paint

The most common decorative use of lead, and one which is also highly utilitarian, is in paints. Of course, red lead, although almost certain to be present as a priming and rust inhibiting painton structural steel and ornamental iron. is seldom seen, but white-lead paint is an indispensable material for use on new construction, as well as in the maintenance of theatres.

White Lead Paint

Pure white-lead paint provides longlasting protection for exterior wood and metal work, but it is on interior walls and trim where white-lead paint performs its most outstanding service in theatre maintenance. This service begins with the application of the paint. Pure white-lead paint is easy working, which facilitates and speeds up the work of the painter. In addition, pure white-lead paint is an ideal base for mixing the most delicate selection of colors for use in any decorative scheme.

Also, the maintenance of a carefully worked-out color scheme executed in pure

LEAD CINCH BOLTS, sometimes called anchor bolts, are important in effecting tight fastenings to concrete. In this picture, from the Lead Industries Association, are seen the lead sleeves assembled with cone nuts.

1945 Theatre Catalog, 4th Edition, Page 164