§ 5. THE EXACT DIMENSIONS OF THE PYRAMIDS.

Fig. 15. Cheops.

R.B. Cub. Brit. Ft.
452 = 761·62
287·767 = 484·887
365·9047= 616·549
430·058= 724·647
639·2244=1077·093

Fig. 16. Cheops.

Figures 15 to 20 inclusive, show the linear dimensions of the three pyramids, also their angles. The base angles are, Cheops, 51° 51′ 20"; Cephren, 52° 41′ 41″; and Mycerinus, 51° 19′ 4″.

Fig. 17. Cephren.

R.B. Cub.Brit. Ft.
420 = 707·70
275·61= 464·40
346·50= 583·85
405·16= 682·69
593·97 =1000·84

Fig. 18. Cephren.

Fig. 19. Mycerīnus.

Fig. 20. Mycerīnus:

R.B. Cub.Brit. Ft.
210= 353·85
168= 283·08
131·14 = 220·97
198·10 =333·7985
296·9848=500·42

In Cheops, my dimensions agree with Piazzi Smyth—in the base of Cephren, with Vyse and Perring—in the height of Cephren, with Sir Gardner Wilkinson, nearly—in the base of Mycerinus, they agree with the usually accepted measures, and in the height of Mycerinus, they exceed Jas. J. Wild's measure, by not quite one of my cubits.

In my angles I agree very nearly with Piazzi Smyth, for Cheops, and with Agnew, for Cephren, differing about half a degree from Agnew, for Mycerinus, who took this pyramid to represent the same relation of Π that P. Smyth ascribes to Cheops (viz.: 51° 51′ 14·″3), while he gave Cheops about the same angle which I ascribe to Mycerinus.

I shall now show how I make Cephren and Cheops of equal bases of 420 R.B. cubits at the same level, viz.—that of Cephren's base.