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36 The MODERN THEATRE SECTIO^<br />
U<br />
Stimulate<br />
Attendance in<br />
FREE<br />
^^renidA<br />
Midweek<br />
Theatres!<br />
Yes sir, Mr. Theatre Owner! Giv,e FREE<br />
HAWAIIAN VANDA ORCHIDS and your midweek<br />
returns will look like your weekend returns<br />
. . . and we've got letters to prove it! Here's<br />
just one example from a theatre owner in Colorado<br />
— ". . . the two evenings I gave orchids<br />
away were outstanding attendance nights for midweek,<br />
and after paying for them, I had a nice<br />
profit above the cost of feature, advertising, etc.<br />
. . . anv theatre that hasn't had an Orchid Night<br />
is missing a chance to do extra business, and gain<br />
some wonderful good will." So try this testedand-proven-successful<br />
method of promoting your<br />
mid-week theatre attendance!<br />
For opening night . . . special picture promotions<br />
. . . jamily night . . or any special event,<br />
.<br />
too.<br />
(<br />
m<br />
For Full Details on How to Stage Your<br />
Hawaiian Vanda Orchid Promotion<br />
MT-nPsT FLOWERS OF H A W A 1 1, LTD.<br />
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NOTE: Our 3-story office buildinj and reflearsal halls<br />
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To incjutre, write in Ad Number 59-B on<br />
Free postcard, page 52, or write direct to:<br />
AMUSEMENT ENTERPRISES<br />
1211 Louisiana BILL SIR05 Houston 2, Tex.<br />
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You pay the same as for cash<br />
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Exhibitors from Maine to California are using:<br />
THE S-O.S. EASY PAYMENT PLAN<br />
to improve their Theatre Equipment actually paying<br />
it off from the Increase in Boxofiice Receipts.<br />
Send for details on our Budget Plan<br />
explaining what you need.<br />
SPECIALI<br />
jri.v.iwi..<br />
TEMPERED MASONITE<br />
MARQUEE LETTERS<br />
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Ueplaces Wagner. Adler, Bcvelite (Specify which you have).<br />
S.O.S. CINEMA SUPPLY CORP.<br />
Dept. C, 602 W. 52 St., N. Y. 19 Cable: SOSOUND<br />
For TICKETS of every deicription<br />
ROLLS - MACHINE FOLDED<br />
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THE TOLEDO TICKET COMPANY<br />
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CONCRETE SAVES STEEL<br />
Continued from preceding<br />
page<br />
cost, but that it will be attractive and retain<br />
its beauty for many years to come.<br />
However, when the total amount of steel<br />
permissible for building construction is<br />
severely curtailed, even the smaller amount<br />
used in conventional reinforced concrete<br />
many at times be excessive. The problem<br />
then becomes one of reducing the amount<br />
of reinforcement needed without materially<br />
reducing the strength or increasing<br />
costs.<br />
'NEW TYPE 0? ROOF CONSTRUCTION<br />
The two portions of a theatre which require<br />
the greatest amount of steel reinforcement<br />
per square foot of area are<br />
usually the roof (and its supporting beams,<br />
if any) and the balcony. The balcony of<br />
a theatre can be eliminated if necessary:<br />
but unless the theatre is a drive-in, the<br />
roof definitely cannot. It presents a problem<br />
in how to save steel without violating<br />
building codes or fire regulations.<br />
One practical solution which found its<br />
first great use in this country during the<br />
last emergency is thin-shell roof construction.<br />
Strong and eminently practical for<br />
spanning large interior areas, reinforced<br />
concrete thin-shell roofs are usually less<br />
than 31/2 inches in average thickness and<br />
require a minimum of reinforcing steel.<br />
For theatres, where a large unobstructed<br />
ground floor area is almost a must and<br />
firesafety is a vital requirement, thin-shell<br />
roofs are literally a "tailor-made" answer.<br />
PRINCIPLE IS EASILY DEMONSTRATED<br />
Without wandering too far into engineering<br />
mysteries, the steel-saving principle of<br />
strength in a thin-shell roof can be easily<br />
and interestingly demonstrated. Tear a<br />
sheet from a small memo pad or select a<br />
playing card from a deck. Now hold the<br />
sheet or card in a flat position by slight<br />
clamping pressure along one of its short<br />
edges, and place a coin on its surface. It<br />
will collapse beneath the weight. But if<br />
the same card or piece of paper is curved<br />
upwards into an arch and held in this<br />
curve by pressure of the fingers, it will<br />
support the coin and perhaps additional<br />
ones as well. The thickness of the card or<br />
paper has not been increased, nor has it<br />
been reinforced by other materials. Its<br />
shape and the method in which it is supported<br />
have been changed, and these make<br />
the difference in its load-carrying capacity.<br />
When the card or paper is held flat, the<br />
weight of the coin is resisted by bending<br />
forces only. When arched, the weight is<br />
resisted by thrusts acting downward over<br />
the curve formed by the shell and outward<br />
against the fingers supporting and maintaining<br />
the curve. The load stresses are<br />
distributed.<br />
The principle of strength of a domeshaped,<br />
thin-shell roof is illustrated by a<br />
table tennis ball, a remarkably tough and<br />
strong object for its thinness and weight.<br />
Half of a table tennis ball supported I'<br />
tween two books wiU carry weights ma<br />
times those it would be capable of suppoiing<br />
if flattened and placed over the saiarea.<br />
The reason is its curved, thrc<br />
dimensional shape. Every portion of ,<br />
dome where a load may be placed is elas t<br />
cally supported by the portions surround!<br />
it, and these surrounding portions provi<br />
forces to resist the load.<br />
Just what does all this mean to a pre<br />
pective theatre owner? As pointed out b<br />
This photograph shows the concrete masonry ce<br />
struction of the Bexley Theatre, shown also<br />
page 35, before the application of light-color<br />
stucco. Use of exposed concrete masonry is<br />
method of conserving critical materials.<br />
fore, a theatre roof must usually span lar<br />
interior spaces unsupported by colum:<br />
which block visibility. A flat roof like tl<br />
sheet of paper, card, or flattened tab<br />
tennis ball, is not capable of supporting<br />
heavy load over large interior areas witl<br />
out beam support and or a substanti<br />
amount of reinforcement. But when archi<br />
or built in dome shape, a concrete roof<br />
remarkable thinness . . . much thinn<br />
than is normally possible in a flat ro<br />
. . . can safely span long distances wii<br />
a relatively small amount of reinforC'<br />
ment.<br />
Naturally the smaller the amount •' |<br />
reinforcement needed, the less steel coi '<br />
sumed.<br />
Prior to World War II, thin-shell roc'<br />
had been in use for some years in Euro] ;<br />
and South America, and a few had bee'<br />
;<br />
constructed in this country. But it was ni<br />
until World War II<br />
that this type of cor<br />
struction found any appreciable measure i<br />
use in North America. Its popularity hi<br />
grown for gymnasiums, auditoriums, ai:<br />
craft hangars, and other buildings when<br />
a large clear ground floor area is neede If<br />
Its use for theatres should be stimulate I<br />
by current steel restrictions, and its popi<br />
larity should increase even more rapid<br />
as more architects become familiar wit<br />
its<br />
potentialities.<br />
PRESTRESSED CONCRETE<br />
Another steel-saving method of reii<br />
forced concrete construction, and one i<br />
the most talked about developments in ei<br />
gineering circles today, is prestressed cor<br />
Crete.<br />
In prestressed concrete, the reinfora