18A V O L U M E 19, N O . 1 2

SOME NEW ATTACHMENTS FOR

S T O R M E R V I S C O S I M E T E R

9812-V, Fig. 2. Showing Stroboscopic lines as seen through window openings when timer is in motion and adjusted to 200 r.p.m.

9812-V, Fig. 1.

STROBOSCOPIC ATTACHMENT (National Lead Company Timer). For use on Stormer Viscosimeters for accelerating and improving the accuracy of the paint consistency test at rotational speed of 200 r.p.m., in accordance with A.S.-T.M. standard method D-562, in which the rate of shear is adopted as a constant, and the force required to produce this prescribed rate" is accepted as a measure of consistency. No timing, dial reading, calculations or interpolations are necessary. When the illuminated, parallel, vertical lines appearing in the viewing window

seem to be stationary, the exact speed of 200 r.p.m. has been reached. In practice, necessary weight adjustment can be made in a single fall. Developed by the National Lead Company Research Laboratories, Brooklyn, Ν. Υ., in cooperation with their Baroid Sales Division. See "Stroboscopic Timer for Stormer Viscosimeter," by E. P. Peterson and Joseph W. Prane, A.S.T.M. Symposium on Paint {Feb., 25, 1947), published by American Society for Testing Materials (Oct., 1947.)

The stroboscopic method of timing is suitable for plant and con­trol testing as well as laboratory research.

In use, the timer is mounted on the spindle and head of a Stormer Viscosimeter, the sample prepared as outlined in A.S.T.M. standard method D-562, and weights, as seem to be indicated from observance of the sample, added to the weight carrier in the usual manner. The brake is then released, permitting the first few inches of fall. If the parallel, vertical lines in the window of the timer seem to rotate in the direction of the paddle, i.e., to the right, the speed is in excess of 200 r.p.m., and removal of part of the load will slow down the apparent motion of the lines. A directional shift of the Unes to the left indi-

9812-V. Stroboscopic Attachment (National Lead Company Timer), for paint consistency at 200 r.p.m., as above described, complete with Bristo wrench, approximately 5 ft. connecting cord and plug, and directions for use. For use on 115 volts, 60 cycles, a.c. Net weight 8l/s oz 19.50

10 % discount in lots of 6 or more.

cates speeds less than 200 r.p.m. Several changes of weights can be made in 12 inches of fall. When the weight has been adjusted properly, the lines will seem to be motionless and the positions re­main unchanged for the rest of the fall. The end points are sharp, distinct and easily observed in a well-lighted room. Subsequent runs at 200 r.p.m. permit observation of thixotropic conditions if they exist.

Laboratory tests made independently by two workers with no pre­vious experience with stroboscopic timing, using eleven test _ oil samples of different consistencies, resulted in a 62% saving in time and greater accuracy when using the stroboscope.

9814-J.

9814-G.

9814-J.

ELECTRIC HEATER, A.H.T. Co. Specification, with adjustable thermoregulator. For use with the Stormer Viscosimeter in determining the viscosities of glues, starches, etc., where accurate temperature con­trol is essential. With extended polished steel top, 315/i6 inches diameter, designed to fit into the holder 0UT' directly under the water or oil bath. Temperature INL

range to 80° C. when using water in the bath, and to 100° C. when using paraffin or similar oil. Maximum temperature can be reached in 35 to 40 minutes; sensitivity of thermostatic control ±0.5° C.

Consisting of a circular steel top with heating unit attached to lower surface, and metal housing with hard asbestos bottom which contains a bimetallic thermoregulator, a 6-watt pilot lamp, and red bull's-eye indi­cator. Thermostat has graduated dial and plastic knob with indicating arrow. Power consumption 110 watts.

Electric Heater, A.H.T. Co. Specification, with adjustable thermoregulator, as above described. With 5 ft. connecting cord, snap switch and plug; for use on 115 volts, a.c. or d.c. Net weight 2 lbs., 3 oz 26.50

STAGE, LIQUID CIRCULATING, to fit into the bath holder of the Stormer Viscosimeter for controlling the tem­perature of the substance under test, either above or below ambient air. Consisting of a cylindrical chamber of nickel-plated brass with flat top and serrated inlet and outlet hose connectors for attachment to a constant temperature circulating bath, or equivalent device. Diameter of top 3 7 / s inches, height lx/< inches; net weight 10 oz 10.00

Copy of new Sup. Ill, 66Stormer Viscosimeter and Accessories," sent upon request.

ARTHUR H. THOMAS COMPANY RETAIL—WHOLESALE— EXPORT

LABORATORY APPARATUS AND REAGENTS WEST WASHINGTON SQUARE, PHILADELPHIA 5, PA., U. S. A.

Cable Address "Balance," Philadelphia