40 



EXPERIMENTAL PHARMACOLOGY 



Fig. 12. Mohr pinch cocks. 



Fig. 13. Marey tambour. 



Jma// 5/zea cup 



Set screw for 



supporting rod 



jcmv for 

 tamoour cup 



Tube io 

 Oncomefer 



M&dium sized cup. 



' i t ' /" 



,,/ Extra \ openings for 



\ \supportiny rod 



cup 



Fig. 14. Adjustable tambour with three interchangeable bowls. All i arts approximately 



half natural size. 



It is exceedingly important for the student to have some larijc-bwlcd tambours. 

 None of these are at present on the market and each laboratory must provide for 

 itself. The ordinary Marey tambour is wholly inadequate for many forms of work 

 because the bowl is entirely too small. The adjustable form here shown is highly 

 recommended for all purposes for which tambours can be used. A mechanical drawing 

 of this tambour is shown in the chapter on shop work where a cheap form of large- 

 bowled tambour is also described. 



