四分律行事鈔資持記 3.101

3.101

定搩量中，初指諸部不定。具如〈隨相〉無主房中。此但撮略彼文，對之可見。今下，示今所取。周尺一尺二寸，為唐一尺，七寸二分為六寸；所餘八分，為唐七分不啻，故云強也。唐令及五六種尺等，並如〈釋相〉房戒委辨。

Under "Determining the Measure of a Span", it first points out that the various divisions are not uniform. It is fully as explained under "unowned rooms" in the "Concomitant Marks" [chapter]. This merely summarizes that text; comparing them will make it clear. From "Now..." downward, it indicates what is adopted here. One foot two inches of the Zhou ruler equals one foot of the Tang ruler; seven inches two tenths equals six inches; the remaining eight tenths equals not less than seven tenths of the Tang ruler, hence it says "ample." The Tang statutes and the five or six kinds of rulers are all detailed as in the "Explaining Marks" [chapter] under the room precept.