20

In the length of trunnions, more or less .05

Diameter of trunnions, less 0.05

In the same gun, no variations to be tolerated in the
position of the trunnions, or in their alignment.

In the vent { diameter more 0.025
{ do. less .000

In lock-piece any dimensions {more .10
{less .00

Variation of position of exterior orifice of vent .05
Idem of interior do. do. .20

Depth of cavities { in the bore or vent .00
{ on exterior surface of reinforces,
{ where turned or planed .10
{ elsewhere, where turned or planed .25
{ on trunnions, within one inch of rimbases .10
{ on trunnions, elsewhere .25

Enlargement or indentation of bore by proof, not to exceed .02

The measures are to be taken by scales corresponding with the standard
measures of the United States.

If two or more cavities should be near each other on the exterior, the
gun may be rejected, though the cavities should be of less depth than
tolerated in the table.

If the trunnions are placed within the limits of toleration, the
preponderance must not vary more than 5 per cent., more or less, from
that fixed in the contract.

POWDER-PROOF.

31. The proof-charges shall be as follows:

----------------------------------+-------+------------------+------+------+
CALIBRE AND CLASS OF GUN. |CHARGE | PROJECTILE. |WADS. | NO. |
| OF | | | OF |
|POWDER.| | |FIRES.|
----------------------------------+-------+------------------+------+------+
Shell-guns. |Pounds.| | | |
{| 35 |Shell 330 lbs.| | 3 |
XV-inch 43,000 lbs.{| 45 |Shell 330 lbs.| | 3 |
{| 55 |Cored sh. 400 lbs.| | 3 |
| | | | |
XI-inch 16,000 lbs.{| 25 |