class="pginternal" tag="{http://www.w3.org/1999/xhtml}a">XXIII.

Siemens' Universal Galvanometer. XXIIIa.           Ditto                       Ditto. XXIV.           Ditto                       Ditto. XXIVa.           Ditto                       Ditto. XXV. Shunt, Commutator, Rheostat. XXVI. Wheatstone's Bridge. XXVII. Test Table, Differential Galvanometer. XXVIII. Methods of Testing—Armstrong—Austrian. XXIX. Drifting Torpedoes. XXX. Harvey's Towing Torpedo. XXXI.           Ditto              Ditto. XXXII. Systems of Attack with Harvey's Sea Torpedo. XXXIII.           Ditto                       Ditto. XXXIV.           Ditto                       Ditto. XXXV. German and French Towing Torpedoes. XXXVI. Whitehead's Fish Torpedoes. XXXVII. Thornycroft's Boat Apparatus for Fish Torpedoes. XXXVIII. Lay's Locomotive Torpedo. XXXIX.       Ditto                  Ditto. XL.       Ditto                   Ditto. XLI.       Ditto                   Ditto. XLII.       Ditto                   Ditto. XLIII.       Ditto                   Ditto. XLIV. McEvoy's Duplex Spar Torpedoes. XLV. The "Alarm" Torpedo Ship. XLVI. The "Destroyer" Torpedo Ship. XLVII. Thornycroft's Torpedo Boats. XLVIII.