Handbook for Light Artillery

by A. B. Dyer

RANGE TABLE FOR 1.65-INCH HOTCHKISS MOUNTAIN-GUN.

• Kind of powder, Dupont H. N
• Weight of charge, 5½ oz
• Weight of shell, 1 lb. 15 oz
• Initial velocity, 1,298 ft.-sec
• Angle of jump, + 22 minutes
• Length of line of sight, 17.93 inches

Range.	Elevation.	Angle of Fall.	Sight- marks.	Drift.	Drift- marks.	Time of Flight.	Remaining Velocity.	Dangerous Space for Infantry.
Yards.	° ′	° ′	Inches.	Yards.	Inches.	Sec.	Feet.	Yards.
100	-0 12	0 12	0.000	0.1	0.008	0.1	1,243	100
200	0 00	0 23	0.000	0.1	0.009	0.4	1,191	200
300	+0 11	0 35	0.057	0.2	0.012	0.7	1,125	180
400	0 23	0 48	0.120	0.3	0.014	1.0	1,099	131
500	0 35	1 02	0.183	0.4	0.014	1.3	1,066	102
600	0 49	1 16	0.255	0.5	0.015	1.6	1,037	83
700	1 03	1 31	0.328	0.7	0.018	1.9	1,007	69
800	1 17	1 53	0.401	0.9	0.020	2.2	984	56
900	1 32	2 16	0.479	1.2	0.024	2.5	961	46
1,000	1 48	2 39	0.562	1.5	0.026	2.8	942	40
1,100	2 04	3 02	0.646	2.0	0.033	3.1	922	34
1,200	2 21	3 27	0.735	2.5	0.037	3.4	902	30
1,300	2 39	3 53	0.829	3.2	0.044	3.8	886	27
1,400	2 57	4 22	0.923	3.9	0.050	4.1	869	24
1,500	3 16	4 48	1.022	4.6	0.055	4.5	853	22
1,600	3 36	5 19	1.127	5.5	0.062	4.9	837	20
1,700	3 57	5 50	1.237	6.1	0.065	5.3	823	18
1,800	4 18	6 22	1.347	7.0	0.070	5.7	810	16
1,900	4 39	6 55	1.457	8.0	0.076	6.1	797	15
2,000	5 01	7 28	1.572	9.0	0.081	6.5	784	14
2,100	5 23	8 02	1.688	10.0	0.086	6.9	771	13
2,200	5 47	8 36	1.814	11.0	0.090	7.3	758	12
2,300	6 11	9 14	1.941	13.0	0.102	7.7	748	11
2,400	6 36	9 57	2.073	15.0	0.113	8.1	735	10
2,500	7 01	10 36	2.205	17.0	0.123	8.5	722	10
2,600	7 27	11 18	2.342	20.0	0.139	8.9	712	9
2,700	7 53	12 00	2.480	22.0	0.151	9.3	702	9
2,800	8 20	12 42	2.624	24.0	0.155	9.8	689	8
2,900	8 48	13 26	2.773	26.0	0.163	10.2	679	8
3,000	9 17	14 10	2.928	28.0	0.170	10.6	669	7
3,200	10 15	15 39	3.239	35.0	0.199	11.6	650	6
3,400	11 16	17 11	3.569	41.0	0.221	12.6	630	6
3,600	12 20	18 45	3.917	48.0	0.245	13.5	610	5
3,800	13 27	20 20	4.284	57.0	0.277	14.5	591	5
4,000	14 35	22 00	4.996	70.0	0.325	15.5	571	4

If the axle of the carriage be not horizontal, multiply the difference of level of the wheels in inches (or the inclination of the trunnions in degrees) by the elevation in degrees for the given range; the result will be the deflection in minutes to be applied on the side of the higher wheel.

Fig. 9.

When the shell is fired, the plunger is forced to the rear, driving the safety-plug into the shell. The small wires being free to let the plunger drive forward, hold it steadily with the rotation of the shell, and keep it from dropping forward on the descending arc of a high trajectory. On impact the plunger drives forward, and the little magazine is exploded by contact with the point.

A Frankford Arsenal point percussion-fuze, small (model 1894), weight 2¼ oz., is now made for 1.65-inch ammunition. It is similar to the fuze for the 3.2-inch field-gun.

DISMOUNTING.

To dismount the mechanism: See [page 4].

To dismount the gun: Throw back the cap-squares and lift straight up at breech and muzzle.

To dismount the wheels: Take out the linch-pins, lift the carriage at the axles and slip the wheels off.

To dismount the axle: Slack back the clamp-screws about one turn; back the small keep-screws about four turns. Dismount the wheels; pull out the axle.

To mount the parts, proceed in inverse order.

LOADING-TOOLS AND INSTRUCTIONS.

Nomenclature.—Loading-press; loading-sleeve; common shell-plunger; canister-plunger; ejector; charge-measure; burster-measure; cartridge-funnel; shell-funnel; cleaning-brush; fuze-wrench.

The loading-tools are supplied in sets, enclosed in an oak chest. They are not to be carried into the field, but should be set up in an appropriate laboratory room.

For methods to be followed see instructions given for preparing ammunition for 3-inch gun, page 31, et seq.