168 



CENTRAL SCIENTIFIC CO., CHICAGO, TI. 8. A. 



R.u.bbe.r Stoppers 



orvct 



Tapered Cbrk-3 



No. 8146. 



No. 3320. 



3280. 



8146. 

 3286. 



3292. 

 3296. 



3298. 

 3300. 



3304. 

 3306. 

 3308. 



CORK GAGE, of aluminum, for use in determining the proper size of cork or rubber stoppers 



for bottles, flasks, etc. For rubber stoppers from 00 to 12 and cork stoppers from 1 to 26 $0.10 



CORK KNIFE, with good quality steel blade 4 inches long, and round wood handle 25 



CORK MATS, Suberite, of compressed cork, for supporting beakers, etc. Diameter, 12 cm. 



Thickness, cm 1 2 4 



Each , 30 .36 .60 



CORK PRESSES, rotary form. 



No A B 



For corks up to, inches % 1%, 



Each 1.00 1.30 



CORK RINGS, Suberite, of compressed cork, for supporting flasks, etc. Highly recommended 

 as a substitute for straw rings on account of their appearance and durability. 



Diameter inside, mm 30 60 90 120 150 



Each 28 .56 .80 .95 1.40 



CORK SHEET, of compressed cork faced on both sides with white glazed paper. Designed 

 especially for mounting insects in entomological work. Size of sheets 18x24x a 4 inch. 



Per sheet 1.00 



CORK SHEETS, XX Quality, size 4x12 inches. 



Thickness, inches % %Q ^4 



Each 20 .30 .40 



Per dozen 2.00 3.00 4.00 



CORKSCREW, wood handle . 10 



CORKSCREW, self-pulling 50 



CORKSCREWS, twisted wire Per dozen .10 



3318. 

 3320. 



3321. 

 3322. 



COUNTING APPARATUS 



COUNTER, Hand Tally, for use in counting colonies of bacteria, and for other laboratory opera- 

 tions. Fits the fingers of the left hand as shown in the illustration. Registers up to 100,000 . 2.25 



COUNTING APPARATUS, Stewart, for counting colonies of bacteria. Consists of a hardwood 

 box 12x8x6 inches, in which is placed a 16-candle power incandescent lamp and an adjust- 

 able support for carrying the Petri dish, illuminated by oblique rays from the lamp, which 

 do not pass into the eyes of the operator. A ruled glass plate is provided on top of the box 

 and the count is made by viewing the colonies on the Petri dish through the glass plate. (See 

 Journal of Medical Besearch for January 1906) 12.00 



READING LENS for use with No. 3320 1.50 



RULED COUNTING PLATE only of No. 3320 6.00 



