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1948-49 Theatre Catalog, 7th Edition, Page 261 (250)

1948-49 Theatre Catalog, 7th Edition
1948-49 Theatre Catalog
1948-49 Theatre Catalog, 7th Edition, Page 261
Page 261

1948-49 Theatre Catalog, 7th Edition, Page 261

ANOTHER POPULAR CABLE is the Whitney Blake TELESEAL which has an unusual construction.

obstructions, or suspended from messenger wires. They are easy to maintain because they are not subject to galvanic action and will not rot, rust, or decay."

The sheath of hard-service neoprene which adapts the cable for service either in ducts or buried directly in the ground, gives the conductor insulation abrasion resistance and eliminates electrolysis, stray currents, and secondary currents. And since the ANHYDREX insulation and the tough neoprene sheath are both impervious to moisture, expensive potheads are said to be unnecessary at the cable terminals. In fact, a simple, waterproof taping job with drip loops is said to sufiice.

The name of the cable is molded into the sheath. Other identification marks, letter, or figures can be molded into the sheath so that phases, circuits, etc., can be readily identified. Minimum order for molded markingeSOOO feet of any size.

Because of its light weight, long lengths of SimplestNHYDREX Underground Cable can be handled in the field by a small installation crew. The cable is available to uSers in 1000 foot lengths. The approximate net price range is: No. 14, $148.00 per 1000 feet, up to 9999 feet $74.00, and over 10,000 feet $66.60; No. 12, $174.00 per 1000 feet, up to 9999 feet $87.00, and over 10,000 feet $78.30.

Whitney Blake TELESEAL

TELESEAL underground communication wire, suitable for drive-in theatres and recommended by many equipment men, is manufactured by The Whitney Blake Company. This wire has a conduc tor of hard copper with an electrolytic lead plating for corrosion resistance and over this a brass plate for enduring adhesion. Around the conductor is a submarine-cable type low moisture absorbing insulation said to have low transmission loss and stability for operation under water for long periods; and over this a tire-tread type neoprene jacket. The neoprene is highly resistant to oil, acid, moisture, abrasion and light.

The No. 14 wire is made with a nominal insulation wall thickness of 0.052 inch. Insulation is adherent to the conductor. The nominal wall thickness of the neoprene jacket on this two wire size is 0.035 inch. And No. 12 is in proportion. Nominal outside diameter of the No. 14 wire is 0.238 inch.

Whitney Blake TELESEAL, which is recommended for dependable, troublefree communication service, is available in the popular two conductor sizes: No. 12 and No. 14 AWG hard copper. Both sizes are available as twisted pair constructor, or single. When twisted, the conductor lay is 5 inches nominally. One conductor bears raised tracers for identification.

A substantial increase in telephone talking transmission is claimed for the product. Wet and dry weather transmission equivalents are practically identical. By way of comparison, the transmission loss of the average weatherproof drop wire can be more than 50 per cent greater in wet weather than in dry.

The Whitney Blake Company suggests that underground splices be avoided whenever possible on any insulated

cable. This can 'be accomplished by looping the wire out of the ground at each speaker post. Where wire is connected to the feeder, a junction box is installed for making the connection and also for service purposes.

No. 14 TELESEAL wire is put up in 750 foot coils and No. 12 in 500 foot coils. If desired, No. 14 can be furnished on 2500 foot non-returnable reels and No. 12 on 2000 foot non-returnable reels, both at a slight additional cost.

List price of the two-conductor No. 14 was-in 1948e$58.30 per thousand feet; and of the two-conductor No. 12, $82.31, with both prices subject to a maximum discount of 30% when the distributor purchases 250,000 or more feet. Other discounts are in effect, depending on linear footage purchased. Normal method of selling is to distributors and national supply houses who can buy in sufiicient quantities to obtain the maximum discount. These distributors or supply houses in turn sell to the theatre owner.

Many theatres have already installed TELESEAL underground cables and the field reaction is said to have been most favorable. Inasmuch as the speaker is carrying voice frequency current and is not exposed to extremely high voltage, the TELESEAL type of Wire, developed originally for the telephone and railway industry, is claimed to be ideally adapted to drive-in theatre usage.


There are other types and brands of underground cables available to drive-in theatre construction; but these are three which are in common use. As a buried investment, the value of which is in the service it performs, great care should be utilized in the selection of a good underground cable and its installation should be completely in conformity with the manufacturers recommendations.


The accompanying picture might well illustrate bad management on the part of some drive-in owner in the more frigid areas around the Great Lakes or New England during the bitter cold months when speakers should be weather protected or stored away. But it doeert!

Actually, this shot was taken by a representative of THEATRE CATALOG at Hallis Drive-in, Gainesville, Georgia, and rushed in at press time.

It would seem that even the sunny south is not immune from unkindly elements, for this is the condition as it existed on January 31, 1949.

To take weather like this, speakers and cable must be tough. And while it may be a little unusual to have weather like this in Georgia, where drive-ins are able to operate the year around, it could happen anywhere.

1948-49 Theatre Catalog, 7th Edition, Page 261