Lightboxes
Cart
alb5408713

SPIRAL STAIRCASE

Spiral staircase to attic. Library Company of Philadelphia, Philadelphia, PA. Spiral stairs wind around a newel (central pole). They typically have a handrail on the outer side only, on the inner side just the central pole, and are often very steep. A pure spiral assumes a circular stairwell and the steps and handrail are equal and positioned screw-symmetrically. A tight spiral stair with a central pole is very space efficient in the use of floor area. A squared spiral stair assumes a square stairwell and expands the steps and railing to a square, resulting in unequal steps. Historic American Buildings Survey, undated (cropped and cleaned).
Share
pinterestPinterest
twitterTwitter
facebookFacebook
emailEmail

Add to another lightbox

Add to another lightbox
add to lightbox print share
Do you already have an account? Sign in
You do not have an account? Register
Buy this image
Loading...
Title:
SPIRAL STAIRCASE
Caption:
Spiral staircase to attic. Library Company of Philadelphia, Philadelphia, PA. Spiral stairs wind around a newel (central pole). They typically have a handrail on the outer side only, on the inner side just the central pole, and are often very steep. A pure spiral assumes a circular stairwell and the steps and handrail are equal and positioned screw-symmetrically. A tight spiral stair with a central pole is very space efficient in the use of floor area. A squared spiral stair assumes a square stairwell and expands the steps and railing to a square, resulting in unequal steps. Historic American Buildings Survey, undated (cropped and cleaned).
Credit:
Album / Science Source / Library of Congress
Releases:
Model: No - Property: No
Rights questions?
Image size:
3400 x 4800 px | 46.7 MB
Print size:
28.8 x 40.6 cm | 11.3 x 16.0 in (300 dpi)
Keywords: