A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . Method of Weighing Cement. The apparatus finally recommendedby the French Commission, after a series of tests by Mr. P. Alexandre,!was a circular funnel with screen, as shown in Fig. 40. The cementplaced upon the screen is stirred with a wooden spatula 4 cm. (if in.)wide, and 25 cm. (10 in.) long, and falls through the screen into thecylindrical measure of one liter capacity (61 cu. in.).. Fig 40. MICROSCOPICAL EXAMI-NATION OF PORTLANDCEMENT CLINKER The structure of
A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . Method of Weighing Cement. The apparatus finally recommendedby the French Commission, after a series of tests by Mr. P. Alexandre,!was a circular funnel with screen, as shown in Fig. 40. The cementplaced upon the screen is stirred with a wooden spatula 4 cm. (if in.)wide, and 25 cm. (10 in.) long, and falls through the screen into thecylindrical measure of one liter capacity (61 cu. in.).. Fig 40. MICROSCOPICAL EXAMI-NATION OF PORTLANDCEMENT CLINKER The structure of Port-land Cement clinker canbe clearly discerned withthe aid of the microscopeand polarized light bypreparing thin sections ofit in the same way as thoseof rocks made by petrog-raphers. Le Chatelier, a Frenchengineer, and Tornebohn, Funnel Used in Weighing Cement{See p. 115.) ?Butlers Portland Cement, 1899, P- HO- fCommission des Methodes dEssai des Materiaux de Construction, 1895, Vol. IV, p. 21 ii6 A TREATISE ON CONCRETE a Swedish petrographer, some years ago identified two essentialmineral entities, and tnree others oi less importance, as constituentsof Portland cement chnker. Tornebohn denominated the two essen-tial constituents alite and ceHte. Mr. Clifford Richardson has within the last few years taken the sub-ject up very elaborately in this country, and his results go to show thatoptical methods of examining clinker will eventually prove of great in-terest, not only in determining the character of
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