76 The Total Solar Eclipse of 1900. 
Attached to the lever 7/7 is a secondary lever J’ J’, coupled to the plunger 
p p by a pin working in a slot, and the plunger carries a pair of diagonal 
mirrors 7 mm, mm m’. 
NW 
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BY fn wor //, = me _€ENTRE LINE. 
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For the greater part of the excursion of the lever // this arrangement 
has no effect on the plunger pp; but just at the end of its journey, the lever 
’7' comes in contact with one or other of the stops ¢7¢, and this causes a quick 
