Toronto. When instantaneous dry plates became available, there was suddenly a market for an accessory shutter. Thornton-Pickard made just such an accessory well after the turn of the century. The shutter was made in many sizes to fit the front or back of a lens and instantly convert the camera used with the lens to operate with the newer faster dry plates.
We saw many of these accessories at our photographica-fairs over the years. Long out of manufacture and marketing, these fancy roller blind shutters can be repaired following sites like that of our own Yvette Bessels, or paulwilliams.com.