B. H. Hill, I Site levels June 1934–Dec. 1935Bert Hodge Hill

Drawing: coordinate grid with points C, D, K', M1, K4, F, VI, G and angles/distances labeled

Margin left: C 57

Margin left: D

Margin left: K'

Drawing: labels: 44°45', 324, 337m, 30°52', M1, VI, 30°51', 257m, K1, 74.20, 50.43', 80.40', M1, 261.m, K4, 70°15', F, VI, K4, G

△ C G VI 44°45' - 392.25 - 74°20' ∠ at VI = 60°55' 2.59356 log s 60.55 9.94147 2.65209 +S 44°45 984758 2.498967 = 315.99m + S 74°20' 9.98356 2.63565 = 356.98m

△ F G VI 70°15'- 326.90 - 5.43' ∠ at VI = 104.2 2.51441 S 104.2 = 9.98684 75.58 2.52757 s 70°15' + 9.97367 2.50124 317.13 S 5.43 + 8.99830 1.52587 = 33.56

Vertical line: side G-VI

D. G. VI 57°27' - 384.96 57°3' 71°30' 2.58542 s 9.97696 2.60846 . S 51°27 9.89324 317.46 = 2.50170

Right page

Margin left: G

Margin left: (6°50')

Margin left: 326.90

Margin left: F

Drawing: triangle labeled F, M, VI, F'; sides 33.56, 18°50', 107°45, 54.10

Drawing: points F, F' with angles 89°05', 84°5

△ G F F' Log 326.90 2.51441 - s. 84.5 = 9.99768 2.51673 + n s 6°50' 9.0748 39.13 = 1.59221 + s 89.5 - 9.99994 328.66 = 2.51667

s 18.50 1.61700 9.50896 1.12596 = 13.37 = FF'

Log 33.562 = 1.52587 S 54.10 9.90887 1.61700 + S 107 = 9.98060 73 1.59760 FF' = 39.59

In view of great slenderness of △ G F F' these results perhaps not too inconsistent. Larger value of F-F' to be preferred q. errisi --

In △ F VI F' (if as is possible) ∠ F is rather 18.5' + so VI 107.45 result for F-F' will be 39.35 & F-VI 33.46 & F' VI = 12.81 If FD reports VI- F' is 12.92 Reading F' F VI = 18.5 ∴ preferable (allowing a little for switch shout &c)

△ F VI F' given 18°5', 54°10 & F' VI = 1294 12.94 1. 11193 & 107°45 12.92 S 18°5 9.49192 1.62001 9.97882 33.74 = s 54.10 1.62001 1.59883 = 39.70 39.64 9.90887 1.52888 = 33.80

G - VI - F' ∠ 1.7', 148°58', 29°55' - 328.66 (G F')

150 5° 43' 15.43 - Sin 29.55 2.51667 9.69787 7.81880 + S in 1°7' 8.28977 = 12.83 = 1.10807