PHOTO-MICROGRAPHIC APPARATUS. 
35 
apparatus stands on a narrow bench, so as to allow the 
weight to hang down some distance below- the stand, 
the available length for the motion is somewhat re¬ 
stricted, and may lead to inconvenience. This defect 
may be obviated by boring a hole in the table, and 
letting the cord pass through this hole. But we have 
never had any trouble with our own arrangement, 
Fig 8 
wherein the cord passes round the whole circuit. Any 
arrangement—and there are some—where the cord 
passes simply round rod and milled head is to be 
avoided; the microscope is sure to be more or less 
pulled aside by such an arrangement when the rod is 
actuated by the hand. 
Fig. g shows what was at the time probably the 
most elaborate apparatus ever constructed for photo¬ 
micrography. It was made mainly to our design, for 
the Royal Veterinary College, by Messrs. Swift and 
Son, and whatever merit there may be in the design 
