er is exceedingly simple, con- tended to be exposed to the atmosphere, while the lat- riers are all thus drawn back, the catch, B, is pushed sisting, as shown in Fig. 2 (which is a front view), of a ter is appropriate for surfaces to be covered up by ma- vulcanite disk having two apertures,… … the top of the shutter board drops into a prevent its cooling and hardening prema- notch on the periphery of the shutter when turely. If the flaring process is prolonged the latter is turned slowly around by a key beyond the proper moment, the result isa applied to the center, and holds the shutter…
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