SHUTTERS 



101 



o 



o 



Fig. 8C. — Wollensak Regno setting shutter. 1, release Fig. 9. — Blade 



lever; 2, pump for bulb release; 3, pump for retarding device; action of double- 

 4, setting lever; 5, exposure indicator; 7, diaphragm lever. blade shutters. 



Fig. 10. — Blade action of three-blade 

 shutter (Julius Springer), (a), blade 

 open; {b), blade closed; 1, pivot of blade 

 5; 2-3, pivots of blades which have been 

 removed for illustration (they are exactly 

 similar to 5); 4, mounting plate; 5, 

 blade; 6, stud to connect blade 5 with 

 sector ring 8; 7, slot in sector ring; 

 8, sector ring; 9, spring; 10, stop stud 

 fixed on plate 4. 



Fig. 11. — Compact shutter and lens 

 assembly (Julius Springer), a, back 

 case or housing; b, front cover plate; 

 c, mechanism mounting plate; d, front 

 lens mount; e, back lens mount; /, iris 

 diaphragm leaves; g, shutter blades; h, 

 diaphragm lever and indicator; i, disk 

 for t, b, or i exposures; k, exposure indi- 

 cating ring; I, diaphragm scale; m-n, 

 levers to regulate the gear-retarding 

 device. 



