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Show A8a. Metric Tape Measure. 2- meter steel pocket tape, graduated in meters, centimeters, and millimeters. Keuffel & Esser No. 860358, $ 4.30. Or: 3- meter, in inches and centimeters. Keuffel & Esser No. 7407- A8b. Folding Ruler. 2 meters long, graduated in centimeters and inches, Keuffel & Esser No. 7966 ME, $ 2.35. A9a. Hand Lens. Double pocket hand lens, 2X- 4X- 8X. Keuffel & Esser No. 83O36O, $ 1.85. Procure from local drafting supply store. A9b. Hand Lens. Bausch and Lomb 10x Hastings triplet magnifier. $ 13.00. Order through local Bausch & Lomb distributor. A10. Millimeter Reticle. E. R. Bogusch Measuring SIide--$ 0.35. General Biological Supply House, 8200 S. Hoyne Ave., Chicago, 111. ( Also distributed by the Douglas Stewart Co., Madison, Wisconsin 53704.) Alia. Balance. Ohaus triple- beam balance model 750- S. $ 25.00 Order from local scientific supply house. A11b. Dial- Type Spring Balance ( Platform Scale). Chati1 Ion Model F1261, with adjustable tare weight setting. Suitable for weighing snow density samples. $ 23.50. Phillips Scale Co., 3130 Elliott Ave., Seattle, Washington, or local Chatilion distributor. A12. Clinometer. Suunto Fast- Accuracy Clinometer. $ 24.00 from Forestry Suppliers, Inc., Box 8397, Jackson, Mississippi. A13. Sling Psychrometer. USWB Spec. 450.1016. ( S. A. No. 208) $ 14.00. Spare thermometers, $ 4.00 each ( they're essential). A14. Psychrometric Tables. USWB. See Bibliography. A15. Aspirated Psychrometer. Battery- driven portable psychrometer, ( S. A. No. 206). $ 75700. USWB Spec 450.8113- A16. Thermograph. - 35° to 110° F. 1- week clock. USWB Spec. 450.1201 ( S. A. No. 151) $ 210.00 ( FSN 6685- 551- 8331, $ 138.00) A17. Compact Thermograph. ( S. A. No. 156) $ 144.00 53 |