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"3"-Point Prism

"3"-POINT PRISM
"3"-POINT PRISMS
PAY THEIR COST WHEN INSTALLED AS PAVEMENTS WITH
BAR-LOCK
GALVANIZED WROUGHT STEEL CONSTRUCTION
BY SAVING THE EXPENSE OF ARTIFICIAL LIGHT
Maximum Glass Area, Perfect Refraction, Greatest Strength, Absolutely Watertight. For further information or the name of representative in your section, address:
AMERICAN BAR-LOCK COMPANY
Offices and Works: 26th STREET and PENNSYLVANIA AVENUE, PHILADELPHIA, PA.

CAUTION—ANY PERSON USING OR SELLING ANY INFRINGEMENT OF THIS COMPANY'S PATENTS WILL BE PROMPTLY PROSECUTED.

The National Builder, November 1905