In any case where—
(a)the provisions of section forty-seven of the Entail Amendment Act, 1848, would apply to any trust disposition, or settlement, or other deed of trust whatsoever, and to the right of any party thereunder ; or
(b)the provisions of section forty-eight of the said Act would apply to any deed and to the right of any party thereunder; or
(c)the provisions of section forty-nine of the said Act would apply to any tack, assignation of tack, or other deed or writing, and to the right of any party thereunder;
if such trust disposition, or settlement, or other deed of trust, or deed, or tack, assignation of tack, or other deed or writing, as the case may be (herein-after in this section referred to as "such writing"), had been dated on or after the first day of August one thousand eight hundred and forty-eight, the provisions of the said sections respectively shall, from and after the passing of this Act, apply to such writing and to the right of any party thereunder, notwithstanding that the same be dated prior to the said first day of August; provided that in the application of the said provisions respectively to such writing, and to the right of any party thereunder, the date of such writing shall be deemed to be the passing of this Act.