LABORATORY SUPPLIES AND CHEMICALS 



201 



3368 



3374 



LETTERS, see Dies. 



3364 LEVELING Screws, brass, for balances, etc. 



For, gramme balance 50 100 200 500 1000 



Set $1.20 1.40 1.60 2.00 2.30 



3368 LEVELS, Spirit, mounted in brass frames. 



Length, inches , 4 5 6 



Each $0.75 1.00 1.25 



3372 MAGNET, Bar, best quality. 



Length, inches ... 5 6 8 10 



Pair , $0.30 .35 .40 .50 



3374 MAGNET, Horseshoe, best English steel. 



Length, inches 2 3 4.5 6 8 10 12 



Each $0.10 .15 .25 .40 .50 1.10 1.80 2.50 



A B C 



3375 



3375 MAGNIFIERS, Doublet. These doublet magnifiers are composed of two sepa- 

 rate piano convex lenses, very carefully and accurately ground and polished, 

 and substantially set in a rich black lacquered mount. Types B and C are 

 nickeled. They give excellent definition and an exceptionally flat field with 

 greater working distance than is usually found in this type of lens. 

 Three different styles of mounting are offered, according to the different 

 purposes for which they are to be used. 

 A for dissecting stand. 

 B for desk use, with hexagonal handle. 

 C in folding pocket case. 



