LABORATORY SUPPLIES AND CHEMICALS 



311 



TEST TUBE OR BOTTLE WASHER 



4233 



The above illustration shows the Washer made with 24 Washing Tubes. Twelve 

 8" and twelve 12". Dimensions over all 14"xl7". Two Control Cocks. 



This Washer, designed for the Johns Hopkins Hospital, enables one to rapidly 

 Cleanse Test Tubes of all lengths, the longer Tubes being suitable for washing any 

 tube up to 14" long, as the water when turned into the High Tube section by turning 

 off the low service will spout six or more inches in the air. The whole 24 Tubes can 

 be used where there are only short tubes to be washed and if the head of water 

 has sufficient pressure. 



The waste water will run off the Washer into the sink at the vent shown at the 

 opposite end from the Control Cocks. 



Hot or cold water can be used as desired. The inlet is at opposite end from 

 the Control Cocks, and we furnish ample length Heavy Rubber Hose to connect 

 to the usual water supply. 

 Price $45.00 



We are listing the above test tube washer, which we consider is an essential in 

 a laboratory of any size. This washer is also adapted for washing such articles as 

 Babcock Milk and Cream Testing Bottles. The apparatus washes both short and 

 long tubes. Also furnished for tubes of 6, 8, 10 and 12" lengths, with a control cock 

 for each size of tube. Prices for types other than the one herein listed upon request. 



TEST TUBE BOILER AND STERILIZER 



A most unique and practical addition 

 to the laboratory. 



It consists of a small cylindrical 



^jjjnjrjjjfr . drum, having a nickel-plated metal body 



with a top and bottom of J4-inch trans- 

 ite. The dimensions of this drum are: 

 height, 2 l /4 inches; diameter, 3 l / 2 inches. 

 The apparatus is mounted upon three 

 leg's. 



Located near the center of the drum 

 there is a metal cup or cylinder 1 1/16 

 inches in diameter and \ l / 2 inches in 

 depth. This is the heating receptacle. 

 The cup is encased in a resistance 

 coil, which provides equal distribution 

 of heat to the entire surface of the 

 receptacle simultaneously, heating it 

 uniformly and very quickly. 



This resistance coil or heating unit 

 is controlled by an automatic-electro 

 thermo-regtilator, contained within the 

 drum. It is adjusted by means of a 

 small screw. To reach the adjusting 

 screw of the thermostat it is necessary 

 to use a small screwdriver. This pre- 

 vents tampering. 



The thermo-regulator completely con- 

 trols the temperature so that the con- 

 tents of the test tube may be brought 

 to the boiling point without boiling 

 over. Metal rings are provided for the 

 receptacle, permitting the use of the 

 following sizes of test tubes: Yz inch, 

 Hs inch, y inch, and 1 inch. 

 Price, complete, including test 

 tube and small crucible, as per 

 4235 illustration $10.00 



