The sea-mans grammar and dictionary explaining all the difficult terms in navigation : and the practical navigator and gunner : in two parts / by Captain John Smith, sometimes governour of Virginia, and admiral of New England.

CHAP. XXV.

A Table, and the Use thereof, whereby you may give Level to a Piece of Ordnance, without the Gunners Rule or Quadrant, to any degree of Mounture under 11 degrees.

The Length of the Gun.	Degrees of Elevation.
1	2	3	4	5	6	7	8	9	10
Five Foot	1 3	2 6	3 8	4 11	5 14	6 16	7 19	8 21	9 25	10 28
Five and a half	1 14	2 28	3 42	4 56	5 70	6 84	7 98	9 12	10 26	11 40
Six Foot	1 22	2 44	3 66	4 88	6 10	7 38	8 58	9 78	11 8	12 29
Six and a half	1 36	2 72	4 8	5 44	6 80	8 17	9 53	10 89	12 25	13 63
Seven Foot	1 47	2 94	4 41	5 88	7 35	8 82	10 30	11 77	13 24	14 73
Seven and a half	1 58	3 14	4 71	6 28	7 85	9 42	10 99	12 57	14 14	15 71
Eight Foot	1 68	3 36	5 4	6 72	8 40	10 8	11 76	13 34	15 12	16 82
Eight and a half	1 79	3 58	5 37	7 16	8 95	10 74	12 53	14 32	16 12	17 92
Nine Foot	1 89	3 79	5 68	7 58	9 47	11 37	13 27	15 18	17 8	18 98
Nine and a half	2 0	4 0	6 0	8 0	10 0	12 10	14 2	16 3	18 4	20 4
Ten Foot	2 10	4 20	6 30	8 40	10 30	12 61	14 73	16 84	18 96	21 8
Ten and a half	2 21	4 41	6 69	8 88	10 81	13 28	15 48	17 68	19 89	22 10
Eleven Foot	2 31	4 62	6 93	9 24	11 56	13 88	16 20	18 51	20 82	23 14
Eleven and a half	2 42	4 84	7 26	9 68	12 10	14 53	16 95	19 37	21 80	24 21
Twelve Foot	2 53	5 06	7 59	10 17	12 65	15 18	17 71	20 25	22 78	25 33
Twelve and a half	2 63	5 20	7 89	10 52	13 15	15 78	18 41	21 4	23 67	26 33
Thirteen Foot	2 74	5 48	8 22	10 96	13 70	16 44	19 48	21 92	24 68	27 40
Thirteen and a half	2 84	5 68	8 52	11 36	14 20	17 4	19 88	22 72	25 56	28 42
Fourteen Foot	2 95	5 90	8 85	11 80	14 75	17 70	20 65	23 60	26 56	29 53

The Use of this Table.

If you are destitute both of a Quadrant or a Gunners Ruler, yet may you Level a Gun to any degree of Mounture under eleven deg.

Exam. 1. Suppose you have a Gun whose length is 9 Foot and half, and you would elevate it to 5 degrees of Mounture.

Look in the Table for the length of the Gun, 9 Foot and a half, in the first Columb of the Table, and in that Line under 5 deg. you shall find 10. 0, which is just 10 Inches, wherefore take any strait stick, and cut it off at that length, which set perpendicularly upon the top of the Base Ring, and level over the top of the Stick, as if it were the hole in the Slider of the Ruler, and the top of the dispart upon the Muz∣zle Ring, and you will make a good Shot.

Exam. 2. Suppose your Gun were 12 Foot long, and you would Mount her to 7 degrees of Elevation.

Look for 12 Foot long in the first Columb, and for 7 deg. in the head of the Table, and against 12 Foot, and under 7 deg. you shall find 17. 71, which is 17 Inches and 71 hun∣dred parts of an Inch (which is almost 3 quarters of an Inch) a Stick of that length set perpendicularly upon the Base Ring, you may level over it by the top of the Dispart on the Muzzle Ring, as if it were through the hole in the Slider.

But if you would Level without a Dispart, then take the Dispart off, and lay it to the foresaid Stick, cutting so much of it off, as was the length of the Dispart; then set the re∣mainder of the Stick upon the Base Ring, and bring the top of the Stick, the Metal of the Muzzle Ring, and the Mark in one Right line, then Prime and give Fire, and doubtless you will make a good Shot.