PLATE 2.

Block-house.

Block-house.

Bill Hook, 1 lb 12 oz.
1′ 412

Bastion.

A. bastion; a, curtain angle; b, shoulder angle; c, salient angle; a a, gorge; a b, flank; a d, curtain; b c, face.

Gatling Blind.

Barricade.

Bucklers.
1. Targe. 2. Franc.

Bridle.

Trestle Bridge.

Trestle Bridge.

BULLET-PROOF GATE.

Trestle Bridge.

Lashing.

Frame Bridge.

Sling Bridge.

Tension Bridge.

Frame Bridge.

Suspension Bridge.

Holdfasts.

Suspension Bridge.