The mariners magazine, or, Sturmy's mathematical and practical arts containing the description and use of the scale of scales, it being a mathematical ruler, that resolves most mathematical conclusions, and likewise the making and use of the crostaff, quadrant, and the quadrat, nocturnals, and other most useful instruments for all artists and navigators : the art of navigation, resolved geometrically, instrumentally, and by calculation, and by that late excellent invention of logarithms, in the three principal kinds of sailing : with new tables of the longitude and latitude of the most eminent places ... : together with a discourse of the practick part of navigation ..., a new way of surveying land ..., the art of gauging all sorts of vessels ..., the art of dialling by a gnomical scale ... : whereunto is annexed, an abridgment of the penalties and forfeitures, by acts of parliaments appointed, relating to the customs and navigation : also a compendium of fortification, both geometrically and instrumentally / by Capt. Samuel Sturmy.

SECT. XXXIX. How to Divide the Gunner's Rule into degr. by help of a Table, sitting it for any Piece from 5 foot long to 14 soot long; and by the help of this Table, any Piece may be Elevated to any degr. without the help of a Quadrant, Ruler, or any other Geometrical Instrument whatsoever.

TO fit the Ruler for one Gun only, here is the Rule for the Deviation of the degr. Note, this Table hath 11 Columns, the first shews the length of the Piece in Feet and half Feet, the other 10 in the Head is 10 degr. and under is Inches and the 100 part of an Inch, from 1 degr. to 10 degr. and so you may take them out of the Table, and set them on the Rulers opposite side.

The use of the Table

If your Gun be 8 Foot long one Inch 68/109 makes one degree; your Gun 12 Foot long 5 Inches 9/100 makes 2 degrees.

Or you may set your Bead to 5 6/100 Inch, to Mount him 2 degrees.

The len. of the Piece	1 Degree.	2 Degrees	3 Degrees	4 Degrees	5 Degrees	6 Degrees	7 Degrees	8 Degrees	9 Degrees	10 Degr.
Feet and ½ Feet.	Inch. 100	Inch. 100	Inch. 100	Inch. 100	Inch. 100	Inch. 100	Inch. 100	Inch. 100	Inch. 100	Inch. 100
5 Foot long.	1 3	2 6	3 8	4 11	5 14	6 16	7 19	8 82	9 25	10 28
5 Foot and half.	1 14	2 28	3 42	4 56	5 70	6 84	7 98	9 12	10 26	11 40
6 Foot long.	1 22	2 44	3 66	4 88	6 10	7 38	8 58	9 78	11 8	12 29
6 Foot and half.	1 36	2 72	4 8	5 44	6 80	S 17	9 53	10 89	12 25	13 68
7 Foot long.	1 47	2 94	4 41	5 88	7 35	8 82	10 30	11 77	13 24	14 78
7 Foot and half.	1 58	3 14	4 71	6 28	7 85	9 42	10 99	12 55	14 14	15 71
8 Foot long.	1 68	3 36	5 4	6 72	8 40	10 8	11 76	13 44	15 12	16 82
8 Foot and half.	1 79	3 58	5 37	7 16	8 95	10 74	12 53	14 32	16 12	17 92
9 Foot long.	1 89	3 79	5 68	7 58	9 47	11 37	13 27	15 18	17 8	18 98
9 Foot and half.	2 00	4 0	6 0	8 0	10 0	12 10	14 2	16 3	18 4	20 4
10 Foot long.	2 10	4 20	6 30	8 40	10 30	12 61	14 73	16 84	18 56	21 8
10 Foot & half.	2 21	4 41	6 69	8 88	11 81	13 28	15 48	17 68	19 89	22 10
11 Foot long.	2 31	4 62	6 93	9 24	11 56	13 88	16 22	18 51	20 82	23 14
11 Foot & half.	2 42	4 48	7 26	9 68	12 10	14 53	16 95	19 37	21 80	24 21
12 Foot long.	2 53	5 6	7 59	10 12	12 65	15 18	17 71	20 25	22 78	25 33
12 Foot & half.	2 63	5 20	7 89	10 52	13 15	15 78	18 41	21 4	23 67	26 33
13 Foot long.	2 74	5 48	8 82	10 96	13 70	16 44	19 48	21 92	24 68	27 40
13 Foot & half.	2 84	5 68	8 52	11 36	14 20	27 4	19 88	22 72	25 56	28 42
14 Foot long.	2 95	5 90	8 85	11 80	14 75	17 70	20 65	23 60	26 56	29 53