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154 JAC. R. MANHSIMER [J. S. M. P. E.
eral sound recording studios and laboratories are being cut up into comparatively small areas for use as stages, recording rooms, battery and generator rooms, film-working rooms, inspection rooms, etc. Many of these are placed in the interior of large buildings and frequently below the street level. In case of failure of the electric current which might or might not take place at the same time as a fire, an unfailing supply of current for emergency and exit lighting is a most important consideration. Therefore, it has been recommended that an independent source of supply for these lights be provided, preferably of the "Surelite" type, in which a storage battery of sufficient capacity to maintain the emergency lights for at least a half hour is automatically kept charged at the proper voltage but is not left floating on the line.
In systems of this type, the emergency lighting is automatically thrown on to the emergency battery supply in case of failure of the normal current supply.
This system of emergency lighting is compulsory for theaters in many states.
As an adjunct to the emergency lighting for dark rooms in film laboratories, I wish to call to your attention a very simple pilot light device originated by Mr. J. C. Kroesen of the Fox Film Corporation and first used, I believe in their plant. This consists of a small red or green pilot light being placed on each group of key switches which operate the white lights. These pilot lights burn continuously and not only assist the laboratory operators in inserting the key to turn on the white lights, but also provide a permanent indicator to enable the white light switches to be quickly located in case of emergency. The local inspection departments have commended this type of construction and it very likely will be incorporated in the new Code.
SILENCING SIGNALS FOR SOUND STAGES
Another problem created in the studio is that of locking the doors leading to stages to prevent disturbance while recording is going on. The fire departments in most cities frown upon locking of exits in any type of building. In the eastern studios of the Paramount-Publix Corporation, Mr. M. W. Palmer, Chief Engineer, has had placed near the outside of each door leading into the various stages, an electrically illuminated translucent sign which indicates very forcibly when recording is going on. These signs have backs coated with a mercury compound so that when not illuminated they give the appearance