TFPE. 185 



Indic'tion. — A cycle ov period of fifteen years, the origin of 

 which is involved in obscurity ; but it is said by some to 

 have been instituted by Constantine the Great in phice of 

 the Olympiads. 



Horol'ogy (Gr. ham, an hour, and Io(/os, a discourse). — That 

 branch of mathematics which treats of the principles and 

 construction of machines for measuring and indicating 

 portions of time, as clocks, watches, etc. 



Metempto'sis. — The solar equation necessary to prevent the 

 new moon from happening a day too late, or the suppres- 

 sion of the bissextile once in one hundred and thirty-lour 

 years. 



Paradl'ionism. — An error in chronology by which an event 

 is related as having happened at a later period than its 

 true date. 



Proempto'sis. — The lunar equation, or addition of a day, neces- 

 sary to prevent the new moon from being le-'koned as hap- 

 pening a day too soon. 



Sciag'raphy (Gr. skia, a shadow, and gvaj Iw^ I write). — Tlie 

 art of finding the hour of the day or night by the shadows 

 of objects caused by the sun, moon, or stars. 



Synchronorogy. — Contemporaneous chronology. 



TYPE. 



Type-Founding. — The art of manufacturing the metal letters 

 used by printers. 



Acrog'raphy (Gr. akros, extreme, and grapho, I write). — The 

 art of producing blocks in relief for the purpose of print- 

 ing from, along with types, and thus to supersede wood- 

 engraving. 



Elec'trotypy (Gr. dektron, amber (for electricity), and tupos, 

 a model or type). — The process of copying metals, en- 

 gravings, etc., and of making stereotype plates by means 

 of electric deposition. 



Photo-galvanog'raphy. — The art or process of obtaining from 

 a photographic negative on glass, by means of a gutta- 

 percha impression, an electrotype plate from which may be 

 taken, as in copper-plate printing, any number of copies, 

 exactly similar to the photograph. 



Ster'eotypy (Gr. stereos, solid). — The art or mode of forming 



IG* 



