5C8 Portobh Elellruol Mackitie. 



front fiJc of the box nt 4j inches from the bottom. Through this tube (when coated with 

 \arnifli or fubftance of any kind within, to prevent its breaking by a difcbargc) paflcs a 

 brafs wire as thick as will cafily move in it, about 4^ inches long, tapped about an inch at 

 each end and a little fmoothcd ; on each end of this wire is a tapped nut which fcrew bac!{ 

 cr forwards to or from the ends of the tube, fo as to hold the w ire in any Ctuation that 

 may be required with regard to the diftance of its ends from tliofe of the tube. The wire 

 has alfo two brafs balls, one of which has its diameter Icfs th.\n that of the tube, that it may 

 move through the circular hole into the box, to prevent its falling on the glafs plate, which' 

 it might do if fcrewcd oft" and on within the box. 



O O are the dircflors with handles of glafs, or baked wood varnifhcd, each fix inches 

 longv befides the balls and wires ; the balls are fall upon the wires, and the wires fcrew int> 

 fockets on the ends of the handles. 



There is yet one part of the apparatus which it w«5 not neceflary to exhibit in the plate, 

 liz. the iufulating (lool; this is ni^ide exadly of a fize to cover the box, namely lOj- 

 iuches by 84, and has four feet of glafs, or baked wood varnidicd, almoll 6 inches longv 

 Underneath that part of the ftool which covers the coUeClor Aides a little drawer, 

 fig. 3. by means of the end-pieces V P, which drawer contains the tube, with its ap- 

 pcndages, milled nut, chains, handles of the direftors, and amalgam, and muft be taken, 

 from the ftool when ufed. The tlirec compartments of the drawer, by being made to 

 £t tlie dircftors and tube, prevent their fl-.aking in carri.ige. When packed, the four feet 

 of the (lool go exaftly into each corner, and the edge of the drawer juft within the 

 fide of the box, by which means the ftool is kept in its place as a cover ; and laftly 

 the wires of the dircflors pafs through the ftool, which is of inch plank, at the middle near 

 the two ends, and, by fcrewiug into the fi.\ed nuts in the edges of the box's ends at K and 

 K, until the balls touch the wood of the ftool, fix the whole fo firm that a handle, fuch as 

 is ufed in a cheft of drawers, fixed on the centre of the ftool, ferves for carrying the whole 

 apparatus by, which has the appearance of a lady's fmall travelling-box, and weighs eight 

 pounds. After having been thus prolix in the defcription of the ftparate parts of this fmall 



machine, I come next to fay a fev words'about the ufe of it. .^s it is neceflavy before 



ufing any machine to have it perfcftly dry, and as the feparate parts require to be fuccef- 

 fively placed before t'lie fire, this machine will be found to poOefs an advantage even in the- 

 preparation, which greatly conduces to expedition ; for after the box is dlfengaged from tlie 

 ftool, and has the tube fcrewcd into its place (both which may be done in one minute), the 

 box may be held in the hand before the fire, where all its parts will be alike dried at tlie 

 fame Dime ; or it may be placed on the end A or fide D at any convenient diftance from 

 the fire on the floor, as occafion may require, whilft the amalgamated leather is preparing. " 



The machine being fried from moifturc and nuft, and amalgam applied to the cylinder,, 

 the ftiock is adminiftered in the following manner, viz. Let the fmall chain fall from the 

 eoUeflor upon the upper coating of the glafs plate, and place thv inner ball at the required 

 ftriking diftance, fuppcfc a quarter of an inch, as the cafe may require, and fix it there by 

 means of the adjufting nuts, and the quantity of the charge will be limited in the fame 

 manner as by Lane's eie£lrometer ; then conneft one chain with the conduaing wire 

 wh'ich palTes through the tube, and the other with a brafs ring conncdcd with the flip of 

 the undtr coating at H (as appears ia figure i, or at I, as is moft convenient), and hook the 

 6. opfofite 



