. The Columbian magazine : or, monthly miscellany. circles,thofe which indicate half hours cutthree of the circles, and thofe whichdefigaate the quarters, cut only tv/ocircles ; as expreffed in the moreover, two other femi-circles, L K. L. and divide the fame into 5o equal parts. Thefeare for the minutes of an hour andwill be pointed out by an index,moved by machinery, to be defcri-bed hereafter, M. N. fig. 2. Is an index or handfeen in profile (w, «, reprefents thefame in front,) and it fits by a fquarehole upon the top of a moveableaxis hereafter mentioned. P. is aclamp fixed
. The Columbian magazine : or, monthly miscellany. circles,thofe which indicate half hours cutthree of the circles, and thofe whichdefigaate the quarters, cut only tv/ocircles ; as expreffed in the moreover, two other femi-circles, L K. L. and divide the fame into 5o equal parts. Thefeare for the minutes of an hour andwill be pointed out by an index,moved by machinery, to be defcri-bed hereafter, M. N. fig. 2. Is an index or handfeen in profile (w, «, reprefents thefame in front,) and it fits by a fquarehole upon the top of a moveableaxis hereafter mentioned. P. is aclamp fixed to the under furface ofthe index by means of two clamp, embraces the two fur-faces of the dial plate, and whenthe index is mounted on its axis,it fhould flide round the edge of thedial plate, and keep the index fromwavering ; but that it may anfwerthis purpofe and at the fame timeflide equally, a fmall fpring of pref-fure C^is placed fo as tobear again ftthe unuer furface of the dial plate,and the bearing of this fpring mayT t 2 be. ■S5»J<#3*«iii JJefcrlpthn of a All infecls witli hard-wing cafes,«is May bugs, cannot be better pre-ferved and lent off, than in a phialwith fpirits, the mouth whereof■ftould be clofcly fnut with a ; in which ftate they arefree from any accidents, except thebreaking of the phial. The other infects that might befpoiled in the fpirits, as flies, but-terflies, &c. are to be pinned throthe body to the bottom of a fmali-box mnde of fir, the height where-of is to be proportioned to that ofthe pins ; and thefe fmaller boxesare afterwards enclofed in a largerone, in order to be fent off. Marine plants are more difficultto be tranfported, and require to be New Solar Dial, 3*7 packed up with particular care, toprevent their breaking on the, voy-age. The beft method is to put onlyone piece into a box, not larger thanan inch, at moft, than the objeftto be placed therein : hilly the boxis to be filled up with faw dull, care-
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Keywords: ., bookcentury1700, bookdecade1780, bookpublisherphiladelphiatseddo
