IT4 Account of. the Tele/cope at Kiel. 



by means of iron wedges ufed as in the Dutch windmills, can 

 be fo elevated that the whole upper part of the building may- 

 be moved upon eight rollers placed above the horizontal 

 wheel. A fmall vertical cylinder^/" proceeds along the fide 

 of the cabin clown to the horizontal wheel, and at the lower 

 end has an eighteen inch wheel g with twelve teeth, which 

 fit into thofe of the large wheel. The fmall wheel, to de- 

 fend it from the injuries of the weather, is inclofed in a 

 box. To the top of this fmall cylinder, which rifes three 

 feet above the platform, is affixed a crofs-bar lever xx, and 

 the cylinder has its point of motion in a collar at /', in which 

 fmall rollers are applied to leffen the effects of friction. By 

 turning the crofs the whole cabin moves round its axis, and 

 the tube of the telefcopc 1 1, connected with it, is thus made 

 to move alfo horizontally. The vertical movement of the 

 tube, which was attended with confiderable difficulty, is 

 effected in the following manner: At the end of the beams 

 Jzk, which project parallel to each other, on a level with the 

 tipper frame of the building, arife the inclined beams ?nmn, 

 joined to the former by mortices at o, and morticed alfo at 

 bottom into the uprights of the cabin. They are fupported 

 by ftrong braces, and, where neceflary, are bound faft with 

 iron fcrews. To prevent all lateral agitation, Profeffor 

 Schrader placed at right angles on the two horizontal beams 

 h k, and fattened to the cabin, another beam H of fufficient 

 llrength, each end of which projects five feet over the 

 beams k k. From thefe ends arife two oblique beams rz and 

 j i, each of which is morticed as at z, a foot and a half below 

 the bridle //, and bound alfo with iron. 



The mechanifm of the movement of the tube between 

 this hanging frame-work is fimilar to that of HerfcheFs 

 telefcope. Along the interior part of each fide of the frame- 

 work, from n to /, is a groove (reprefented in the plate by 

 pricked lines), and a ftrong oblong rectangular frame moves 

 ill this groeve by means of four fmall iron rollers fixed 

 to the comers with fcrews. By the crofs lines vv the 



place 



