Chicago : Engineering and Contracting Pub. Co. · leaf 222
nimum, istaken as the penetration of the sample. The needle should be removed and thor-oughly cleaned by wiping with a dry cloth,after which it is ready for another test. Thepoint of the needle should be examined fromtime to time, with a magnifying glass to seethat it is not injured in any way. If… … Fig. 11—New York Testing 20S ENGINEERING & CONTRACTING Vol. XXXVI. No. 8. USE OF PENETRATION TEST. This test is made on all semi-solid and solidoil-asphalts, asphaltic cements, and nativeasphalts, but seldom on tar products. It is al-so often made on the residues of materialssubjected to the…
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