This building has a good example of a sawtooth skylight.
Here is a look from the inside.
The sawtooth style layout allows for a large roof of a factory, warehouse, or gathering space to be installed without the use of modern flat roofing products. This type of roof allows for a large area of covering without the need for interior drainage systems and large span structural framing elements.
This type of roof is very similiar to a clerestory roof.
Clerestory roofs have been used in building architecture going all the way back to Greek and Roman architecture. Sawtooth and clerestory roof systems allows for passive fenestration and increased ventilation.
This type roof was commonly built in the large factory and warehouses in the 19th century and has recently made a resurgence with an increased emphasis on green construction which values the passive airflow and luminance.