CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



407 



No. 10606 (shown in horizontal position) . 



No. 10686. No. 10690. No. 10692. No. 10696. No 10606 (snown 



No. 10590. PLANT PHYSIOLOGY APPARATUS vertical^osition). 



(This section has been practically eliminated on account of the difficulty in obtaining deliveries. A 

 return to normal conditions will result in a large section being inserted in the catalog covering the re- 

 quirements for this subject.) 



10590. AUXANOMETER, a : imple and practical apparatus for measuring plant growth. A silk thread 

 attached to the plant passes over a pulley with which it is held in close contact by a weight. 

 This pulley moves freely and the pointer attached to it is provided with a counterbalance. 

 The scale is accurately divided, each division representing a growth of .01 inch, and may be 



placed at any desired height on the support rod $4.50 



10606. CLINOSTAT, for investigations involving plants of moderate weight where great precision olf 

 revolution is not required. It consists essentially of the works of a powerful eight-day clock, 

 geared to a revolution in fifteen minutes and enclosed in a practically dust and moisture-proof 

 case, 16 cm in diameter. A ball-bearing shaft takes the strain from the works, which are 

 started and stopped by a cylindrical nut projecting from the upper surface. It is to be wound, 

 not too tightly, once in two days, which may be accomplished without disturbing the plant. 

 Properly used" it will carry a 4-inch or smaller pot horizontally, or a larger size vertically. 

 As with all clinostats, however, it revolves with greater evenness the smaller the weight it 

 has to carry, and consequently the smallest pots allowed by the subject under study should 

 be used. The size with which the instrument works best is the three-inch, this size, how- 

 ever, being larger than commonly supposed, since the measurements of pots are all internal. 



Complete as described with directions for use 25.00 



PLATE, Arsenic, see Arsenic Plate. 

 PLATES, Asbestos, see Asbestos Pads. 

 PLATES, Desiccator, see Desiccators. 

 10686. PLATES. Glass, circular, for covering beakers, dishes, etc. Edges not ground. 



Diameter, mm 60 80 



Each 06 .08 



10688. PLATES, Glass, circular, same as Xo. 10686, but ground on one side. 



Diameter, mm 60 80 



Each 10 .12 



10690. PLATES, Glass, circular, snme as No. 10686, but with hole in center for stirring rod. 



roughly ground. Diameter, mm 75 



Each 20 



10692. PLATES, Glass, circular, same as No. 10690, but with hole at side for stirring rod. 



100 120 



.12 .U 



Edges not ground. 

 100 120 



.16 .20 



Diameter, mm 



Each 



10696. PLATES, Glass, square, for covering jars, beakers, etc. 



Length of side, mm 50 



Each 03 



Per dozen 25 



60 80 100 120 



.15 .20 .25 .30 

 Edges not ground. 



75 100 150 200 



.04 .05 .10 .16 



.40 .50 .95 1.60 



150 

 .16 



150 



.24 



Edges 



100 

 .25 



150 

 .40 



250 



.25 



2.50 



10698. PLATES, Glass, square, same as No. 10696, but of double thick glass and ground on one side. 



Edges not ground. No A B C D E P 



Length of side, mm 50 75 100 150 200 250 



Each 04 .05 .06 .09 .20 .30 



Per dozen 40 .50 .60 .90 2.00 3.00 



10702. PLATES, Glass, heavy plate, square, ground rough on one side, with edges slightly ground. 

 For use with bell jars, etc. 



Length of side, mm... 100 125 150 200 250 300 375 500 



Each 30 .40 .50 .70 1.20 1.50 2.25 3.75 



10708. PLATES, Glass, blue cobalt, rectangular, for flame tests. 



Size, mm 50x50 50x75 75x75 75x100 100x100 



Each 10 .12 .15 .20 .25 



