§4 V a tent Tilegrafh. 



fitualion that the Jlyle fliall caft no fliadow : when this is 

 the cafe the globe will be properly placed ; or^ as it is ufually 

 called, reftified for the time of day. 



This inltniment may alfo be ufed for taking diflances of 

 places or ftars, on different parts of the globe, which are not 

 fnorc than ten degrees afunder. 



XVI. A Jciu Particulars tefpefling Mr. BoK'l's Patc7it 

 Telegraph* . 



i HTS Telegraph exhibits the alphabetic or other cha- 

 rafters, or fignals, by means of lamps rendered vifible and 

 invifible by a mechanifm fimple in its conftrnftion and im- 

 mediate in its efFefts, as alfo by boards or other opaque 

 bodies, which may, in like manner, be rendered vifible or 

 invifible at pleafure, by alternately prefentlng their fronts or 

 their edges to the eye. Or by lamps and boards fo combined 

 together, that both or cither may be ufed : but perhaps the 

 modes eafiell in fitting up and application are the following, 

 viz. ; 



Twenty-five lamps are placed in a frame at equal diftance« 

 from each other, as reprtfentcd by the white dots in fig. i. 

 No. I, (plate III) each having a moveable cover, or blind, 

 fitted to it, in fuch a manner that, when they fall down, (which 

 thev do by their own weight) the lamps, or rather the flames 

 of the lamps, are intercepted and rendered invifible, fo pre- 

 fenting a mere blank to the eye placed in front of the frame, 

 as in fig. 2; No. i. 



Another frame is provided having grooves cut in it : and for 

 each letter of the alphabet or other fign wiflied to be ex- 

 hibited, an oblong piece of wood is alfo provided, made fo a? 

 to flide backward and forward in thefe grooves, having an 

 alphabetical letter or other fign, confpicutjufly marked on the 

 outer cud of it. Any one of thefe pieces of wood, by 

 being pulhed in or drawn out, pulls all at once from before 

 the lamps, or lets down (by means of ropes or wires) as many 

 lamp-covers or blinds as are necefl'ary to exhibit that particular 

 letter or fign marked on that particular piece of wood, fo 

 puflied in or drawn ont. The letters of the alphabet fo ex- 

 liibitcd, are reprefentcd by figures 3 to 38, No. i. 



The fajne thing, however, may be accomplilhed by means 

 of nine lamps only. Fig. J, No. 2, rcprefents the nine 

 lamps, rendered vifible by having their covers or blinds re- 

 moved as mentioned above. Fig. 2, No. 2, rcjircfents the 

 whole covered. Figs. 3 to 28, No. 2, reprefcnt the whole 



'■ Coinraunicattd by Mr-Boaz. 



alphabet. 



