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1948-49 Theatre Catalog, 7th Edition, Page 358 (345)

1948-49 Theatre Catalog, 7th Edition
1948-49 Theatre Catalog
1948-49 Theatre Catalog, 7th Edition, Page 358
Page 358


1948-49 Theatre Catalog, 7th Edition, Page 358

easy calculation which will give the eye level for each row. This eye level can be translated to floor elevations simply by adding or subtracting the eye height used, to the result. To determine the elevation of the floor slope mathematically, the following method; of procedure should be followedesee Diagram #2.

F is the focal point or bottom of screen; S is the back to back spacing; X is the vertical distance from the focal point to the top of head of the occupant of the first row.



lst stepg =a=eye level 2nd row, below head of (E occupant of 1st row

X + a + 3'8" equals door elevation of 2nd row, measured 1'6" forward of the eye line from the datum line



2nd stew X-(5"-z1) Dx=b=eye level 3rd row (-+1) S 3rd stepX-(5"-a)-(5"-b) n\#:c (gd-Z) Last stepX*(5"-a)-(5"-b)-(5"-c) - - (5"-2L D eyelevel (g+(1 X number of seat spaces)) last row

When "X" value becomes zero all minus signs become plus.

Diagram 3 shows the effect to the door when the focal point is lower and Slght lines figured for lst row vision.

(Diagram #3)

Diagram 4 shows how the door drop can be reduced when sight lines are based on staggered seating.

(Diagram #4)

Diagram 5 illustrates the effect to the

floor when the screen position is raised. (Diagram #5)

1948-49 THEATRE CATALOG

DIAGRAM ZeMethod in which the proper eye level can be translated to floor elevations by adding or

subtracting the standard eye height. Below. Diagrams 3. 4. and 5 Show various results.
1948-49 Theatre Catalog, 7th Edition, Page 358