MEDIUM-POWEE PHOTO-MICROGRAPHY 65 



Fig. 32 



VAN HEURCK MODEL. SOLD BY WATSON & SONS, OF 313 HIGH HOLBORN, LONDON. W.C. 



DIMENSIONS. 







INCHES 



Height when in vertical position and body racked down 



. I3| 



Height of stage 



6 



Height of optical axis when horizontal .... 



8| 



Spread of tripod foot ........ 



8i 



Diameter of mirrors ........ 



2| 



Internal diameter of draw tube ...... 





