L.

LATENT HEAT, 122–3.

LAWSON, JAMES, on Boulton’s Mints, 391.

LEMON, WILLIAM, Penzance, 69.

LETTER-COPYING MACHINES invented by Watt,--partnership, 265.

LOCOMOTION BY STEAM, 187; patent by Watt, 333, 337; Edgeworth, 336; Murdock’s model, 336–7; Symington, 435–6.

LUC, M. DE, friend of Boulton and Watt, 351, 369, 376, 381–2, 395, 476.

LUNAR SOCIETY OF BIRMINGHAM, 367–70; its discussions, 375; alleged photographic discovery, 382–3; demise of the Society, its influence, 385; dissolution by deaths, 465.