TYPE 1 



fe f^/dl -.-tP 7 1 RlDDELL 





0G& 



2 Wenham-Riddell 



"- r 3 Stephenson 



JOURX. R. MICR. SOC. 1914. PI. I. 



TYPE 2 



W 



6 Powell & Lealand 



7 Wenham-Powell 



8 Abbe 



4 Nachet 



5 Wenham 





I 



R 



9 Leitz 



10 Beck 



London Etching Co., Ltd., Eng. 



