The silk to be opened is placed on a latticed sheet or feeder, and thus slowly conveyed to a series of rollers or porcupines (rollers set with rows of projecting steel pins), which hold the silk firmly while presenting it to the action of a large receiving drum, covered with a sheet of vulcanized rubber, set all over with fine steel teeth.
Or, if hard, its surface can be picked all over with a bush hammer.
The surfaces are pitted all over with perforations of two kinds, viz.
There are two wooden sarcophagi carved all over with Hebrew inscriptions.
This was treated with compound, and a heavy gage felt covering was cemented all over with a cold mastic.
