. Cement and concrete. n i iEEE f 3A Yl & 0 Fig. 7. I 2 -RUSSELL CLIP 3 in. sometimes been assumed that because this clip eliminated clip-breaks it must give a higher apparent strength than the rigidform. No extensive series of experiments have been publishedwhich permit of comparing this clip with other forms, butfrom the results obtained above, in using rubber cushions, itwould appear that the Cock clip may give lower apparentstrengths. BREAKING THE BRIQUETS 143 210. The form of clip designed by Mr. S. Bent Russell is•constructed on the evener principle, each clip having free-dom of motion i
. Cement and concrete. n i iEEE f 3A Yl & 0 Fig. 7. I 2 -RUSSELL CLIP 3 in. sometimes been assumed that because this clip eliminated clip-breaks it must give a higher apparent strength than the rigidform. No extensive series of experiments have been publishedwhich permit of comparing this clip with other forms, butfrom the results obtained above, in using rubber cushions, itwould appear that the Cock clip may give lower apparentstrengths. BREAKING THE BRIQUETS 143 210. The form of clip designed by Mr. S. Bent Russell is•constructed on the evener principle, each clip having free-dom of motion imparted by four pin-connected joints (see ). It is sought to prevent any but an axial pull being ap-plied to the briquet. On account of details of construction,into which it is not necessary to enter here, the clip must bein its normal position when the briquet is inserted, in orderthat the possibility of cross-strain shall be effectually a result of many tests with this form and the ordinary En-. I % Vt Va- O * Z Fig. 8. —SINGLE GIMBAL CLIP gineers Standard, it was found that they gave very nearlythe same strength. But that the evener motion itself was ofsome value was shown by a series of experiments in which partof the briquets were broken by this form of clip without modi-fication, while part were broken by the same clip when it hadbeen changed to a rigid form by means of a clamp that elimi-nated the evener motion. It is believed that with some modifi-cations this clip will give good results, and it may be used al-most as rapidly as the ordinary rigid form. 144 CEMENT AND CONCRETE 211. Several experiments were made with a clip in whichthe gimbal principle was applied, the stress passing from themachine to the gripping points through knife edges placed inthe line joining opposite gripping points and midway betweenthem * (Fig. 8). Higher results were obtained with this form,the Single Gimbal, than with any of the styles with which itwas compared, but it wa
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