Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . earance. See JIuspratts Chemistry, II. 530. Morse Alpha-bet. The telegraphic alphabetcontrived by Professor ilorse, and which has practi-cally nearly superseded all others on land routes intheUnited States and on the continent of Europe,is CDmposed of a series of dots and dashes. Thoughadapted for being instrumentally recorded on paper,, it is usually read by so
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . earance. See JIuspratts Chemistry, II. 530. Morse Alpha-bet. The telegraphic alphabetcontrived by Professor ilorse, and which has practi-cally nearly superseded all others on land routes intheUnited States and on the continent of Europe,is CDmposed of a series of dots and dashes. Thoughadapted for being instrumentally recorded on paper,, it is usually read by sound, the receiving telegraph-ist writing down the words as they arc transmitted. Fig- 3225 is the Jlorse telegraph apparatus, withrelay a ; the invention of Professor Henry of theSmithsonian Institution. The key b being up, a cur-rent arriving by tlie line-wire c passes from c to d,thence through f to the coil of the relay/, and throughthis to the earth. The electro-magnet of the relayI attracts an annature, whose contact completes theI circuit through the local battery g, in which the coiJ, that operates the annature h, constituting the in-I dicator, is included, i shows that part of the appara- MORTAU. 1476 MORTAU. Fig. A — 31 Y A >r — z B 0 Cti c o Understooil D P 1 K - Q, 2 E B » y s --- 4 G T — 5 H U (i I ? u 7 J K V W 0 III- T. X 0 Morse Apparatus antt Alphabet. tus by wliiili the may be impressed on a slipf i«]pii-. if i-er|uirej. Mortar. 1. (Grindin//.) A vessel, generally inthe toim of a bell or Ionical frustum, in which are pounded by a pestle. When large, theylire made of oast-iron ; a simdler size is made ofbronze, and those for more delii?ate pharinaeeuticalo])erations are of marble, pottery, porphyry, or are >ised in connection with a pestle, whieh inthe larger mortars is of iron and in the smaller is ofporcelain or agate. The Wedgewood ware has longbeen a favorite for this ymriiose. The dilficulty is to find
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