The Art of Travel by Francis Galton : image 50

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TABLE Foil ROUGH TRIANGULATION without the usual Instruments, and without Calculation.

Chord of angle situated at the opposite end of base to that from which we desire to learn the distance across the river.


			n	co		r-	.	00	-q" cA	Q>	-41 m	O	o	N			N	r	N		-41 w	a,		a~-i	-dn
	5	57	60	64	67	70	73	75	78	81	84	87	89	92	95	98	101	105	109	113	118	123	129	137	116
;q	5f	55	59	62	65	69	72	74	78	81	84	87	90	93	96	1.00	103	107	112	116	122	128	135	144	155
	6	54	57	61	64	68	71	74	77	80	84	87	90	94	97	101	105	110	185	120	126	134	142	153	167
st	61	53	56	60	63	67	70	74	77	80	84	87	91	95	99	103	108	113	119	125	132	141	151	161	1a2
	7	52	55	59	63	66	70	73	77	81	85	88	92	96	101	106	111	117	123	130	139	149	161	178	200
	7f	51	55	58	62	66	70	73	77	81	85	89	94	98	103	109	184	121	128	136	146	159	114	794	223
	8	50	54	58	62	66	70	74	78	82	86	91	95	101	106	112	118	126	134	144	156	170	189	215	253