Also, templet.
Origin:
1670–80; alter. of templet, appar. by falsely etymologizing final syllable as plate1
Word Origin & History
1677, templet "horizontal piece under a girder or beam," probably from Fr. templet "weaver's stretcher," dim. of temple, which meant the same thing, from L. templum "plank, rafter," also "building for worship" (see temple (1)). The meaning "pattern or gauge for shaping a piece of work" is first recorded 1819 in this form, earlier temple (168
; the form was altered 1844, probably influenced by plate, but the pronunciation did not begin to shift until much more recently.
Online Etymology Dictionary, © 2010 Douglas Harper
http://dictionary.reference.com/browse/templet