37© Dr. Herschei/s Description of a 
order to secure it against the damp air, to which it was soon 
to be exposed. 
As the tube was now much lighter than it would be here- 
after, we transported it into my garden in the following man- 
ner. Many short poles, about 5 feet long each, were joined 
two and two by a piece of coarse cloth, such as is used for sacks, 
about 7 feet long each. This, being fastened in the middle, 
left at each end part of the pole to serve as a handle for a per- 
son to hold by. The cloth of one of these being put under 
the tube, there was left one of the poles at each side, and four 
men taking hold of the ends of the poles, might conveniently 
assist in carrying the tube. When six sets of these were put 
under the tube, it was with great facility lifted up by 24 men, 
who carried it through an opening which we had made at one 
end of the barn. The inclosure of part of my garden having 
also been taken down, with some trees that were in our way, 
it was safely landed upon my grass-plot ; where a proper appa- 
ratus of circular blocks was put under to receive it. While it 
remained in this state, we prepared every thing for its recep- 
tion, and afterwards moved it into its place, and supported it 
in an horizontal situation. 
It will be necessary now to return to the rest of the machi- 
nery, which by this time was in great forwardness. 
Two solid cast-iron concave rollers, 6^ inches broad, and 
10 inches in diameter, are mounted upon an axle or iron bar, 
inches square ; the axle in the middle being swelled out 
so as to admit of a pivot 2^ inches thick to pass through it, 
without being weakened by the hole. The tube is mounted 
upon this at the lower end, and as the speculum lies in this 
