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    Spherical nickel sulfide inclusion ball

    A rare impurity known as a nickel sulfide inclusion is a tiny metallic ball that grows over time with sufficient force that it can catastrophically shatter tempered glass. This is what nickel sulfide inclusions look like.

    h07-looking-up-test-chamber.jpg

    Before building the actual building, the best projects include the construction of a project specific mockup for testing. Here is a look inside some of the best labs in the USA.

    Chicago skyline near Lincoln Park

    Original architectural background images from Chicago Window Expert.

    Phil Saineghi

    In memory of Phil Saineghi of J&D Erectors. Phil, his partner Nick Rossi and their team of Local 63 Ornamental Ironworkers literally built much of Chicago's world class skyline. Phil will be deeply missed by his family, friends and business associates.

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Photo of the day

g4-remove-air-test-tare.jpg
After the first set of readings, the plastic tare sheet is removed. Then the readings are taken again. The difference between the initial and current air flow readings are attributed to the skylight. If the airflow measured through the skylight is less than what is allowed, then the test is a PASS.