File:The Columbian magazine - or, monthly miscellany (1786) (14579549538).jpg

Identifier: columbianmagazin17861787phil (find matches)
Title: The Columbian magazine : or, monthly miscellany
Year: 1787 (1780s)
Authors:
Subjects:
Publisher: Philadelphia : T. Seddon, W. Spotswood, C. Cist & J. Trenchard
Contributing Library: University of Pittsburgh Library System
Digitizing Sponsor: University of Pittsburgh Library System

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Text Appearing Before Image:
ayHand fupported In all pofitions, andflip up and down with a uniform fric-tion, there is a fmall piece of watchfpring G, rivetted to the middk ofthe crotchet, and prefiing with itstwo ends againfl: the long fquarewire. H is an arm fixed to the longwire, bearing a fmall ring I, this ringis a little larger than a commoncandle, and its ufe is to keep thecandle upright, and prevent its fall-ing againfl; the glafs cafe, hereaftermentioned, if it fhouldbe too loofe inthe candle flick, or not fet perpen-dicular. K is another arm fixed tothe top of the long wire, and bear-Ing a ring L, larger than the onejult mentioned. This ring is for thereception and fupport of the glafs M,which covers the flame of the candle,fcreens It from the common air, andmakes it burn with a fleady andu-niform light. The glafs M is oneof thofe ufed In the new patent-lamps. It is a tube open at both ends,2y inches wide, and near 4 incheslong—and has a rim at the top, bywhich it hangs on the ring L. As the rX.jM/^^.
Text Appearing After Image:
An improved Method of tonguing an Harpfichord. the candle waftes, the glafs mull beflipped down; or if it fhould want tobe InufFed it may be raifed, or low-ered by means of the knob N, fo asto expofe the wick and flame for put to the correfpondingparts- 421 that purpofe. Fig. 2, rqjrefentsthe machine detached from the can-dle-flick, and without the glafs. Inthis the fame letters of reference are Defcription of an improved Method of tonguing a Harpsichord,or Spinnet. By F. H. Efquire. TH E firings of a harpfichordare made to vibrate by theimpulfe of fmall pieces of a crowquill; thefe, from the manner inwhich they are applied, are compel-led to perform their oiBce to fuchdifadvantage, that many becomeweak, and fail with a little ufe, andwhat is called the touch of the in-llrument becomes thereby unequaland difagreeable, both to the per-former and hearer. I attemptedtwo or three years ago to remedythis imperfection. My firll idea wasto encreafe the length of the quill,fo as to make it ad

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