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Quality. |
When Commercial
Prism Plates or
Factory Prism
Plates Are Required. |
The plates shall be composed of Luxfer Prism
lenses made of clear crystal, of prescription indicated on the drawings
by letter or letters, and as per list and diagram attached.
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Electro-Glazing. |
When Sash,
Lucidux or
Forilux
Are Required. |
All sash, lucidux or forilux plates shall be
built up of Luxfer Prism lenses, united and held in place by copper
ribbon not less than 7/32 inches in width and of .035
of an inch in thickness, and subjected to the process of electrolysis,
known as Electro-glazing, for a period of not less than thirty-six
hours.
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Electro-Glazing. |
When Canopies
Are Required. |
All plates used for canopies shall be built
up of Luxfer Prism lenses, united and held in place by copper ribbon
not less than 9/32 of an inch in width and of .035 of
an inch in thickness, and subjected to the process of electrolysis,
known as Electro-glazing, for a period of not less than forty-eight
hours.
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Effective Glass Area.
All plates shall expose an effective glass
area equal to 90 per cent of the entire surface of the plate, and in
no case shall the metal work of the plate between the prism lenses
exceed one eighth of an inch in width on the surface.
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Distance Between Prism Lenses.
The ends of the prisms on one lens shall not
be separated from the ends of the prisms of adjoining lens in the same
plate more than three-sixteenths of an inch measured parallel to their
lengths, and the distance between the adjoining bases of prisms in
adjoining lenses in the same
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