NEW IN 2009

A Closer Look at the Earth Kit

Beginner's Fossil Identification Kit

Stethoscopes

An excellent choice for listening to heart and chest sounds. Use these stethoscopes in combination with our Aneroid Sphygmomanometer, 7-1371 while working with blood pressure. Available in Red, Blue, Yellow, and Green.

Flint Glass Tubing

Flint glass is also known as soda lime glass. It has a lower melting point, chemical resistance, and expansion rate than does borosilicate glass. The tubing listed is known as apparatus weight tubing, which is a reference to its wall thickness.

Physical Properties Of Flint Tubing:

1. Softening Point: 705° Centigrade
2. Annealing Point: 522° Centigrade
3. Solbility, ml: 7.8ml
4. Lead Oxide: <0.01%
5. Arsenic and Antimony: <0.02%
6. Coefficient of Expansion x 10: 94.1

Tubing Pieces Per Pound

	1Ib.	1Ib.	1Ib.	1Ib.	5Ib.	1Ib.	5Ib.
	12"	24"	30"	48"	48"	60"	60"
5mm	45	23	18	11	55	9	45
6mm	36	18	14	9	45	7	35
7mm	29	15	12	7	35	6	30
8mm	24	12	10	6	30	4.8	24
9mm	20	10	8	5	25	4	20
12mm	15	8	6	4	19	3	15
14mm	13	7	5	3	15	2.6	13
16mm	9.4	5	4	2	10	1.8	9
18mm	8.3	4	3	2	10	1.6	8
20mm	7	4	3	2	10	1.4	7

Please note, the 5-lb packages are normally sold only in combined case quantities. You can combine 6 pkg. assortments of any size to make a case.

App aratus Weight Flint Tubing Wall Thickness

Stock Number OD Dia. mm Wall mm
7-2410, 7-2411-01, 7-2411-02, 7-2411-03 5mm ± .20 1.00 ± .05
7-2410-01, 7-2412-01, 7-2412-02, 7-2412-03 6mm ± .20 1.05 ± .05
7-2410-02, 7-2413-01, 7-2413-02, 7-2413-03 7mm ± .20 1.10 ± .05
7-2410-03, 7-2414-01, 7-2414-02, 7-2414-03 8mm ± .20 1.15 ± .05
7-2410-04, 7-2415-01, 7-2415-02, 7-2415-03 10mm ± .20 1.20 ± .05
7-2420-01, 7-2420-02, 7-2420-03 20mm ± .375 1.40 ± .05

Van De Graff Generator

This excellent quality generator consists of an aluminum collector sphere (mounted above the neoprene belt) and a sturdy base with removable terminal housing. The clear belt housing tube allows for easy viewing of the moving parts. 250,000 volt potential. (8" x 11" x 24"; 10lbs)

Battery Holder - D cell

"Yellow" type battery holder does not fit with "blue" type (7-BH-4) Color is currently blue but may change without notice. (battery not included)

Map Compass

Instructional Map Compass for Students! Learn map navigation and basic orienteering with this compass. Students can use this compass to locate true magnetic north. Inexpensive enough that all students can have one. Scale shown in mm, with 1:50000 and 1:25000. Small magnifier located in baseplate. Overall baseplate dimensions are 5 ½ long by 2 3/8 wide by 1/8 thick. Thickness including the compass is ¾”.