 | 1749 - 386 pages
...frame, upon which the inftrument moves ; and a ilrong brafs arch having holes at every degree, through which a ftrong pin is to be put, according to the elevation. For by thefe means, afid the ftrength of two men, each taking hold of two handles, the machine is conveniently... | |
 | Benjamin Martin - Science - 1772 - 516 pages
...moves ; and a ftrong Brafs Arch, having Holes at every Degree, through which a ftrong Pin is to he put, according to the Elevation. This Arch and the...Arch, at other Times, lies conveniently under the BottomFrame. When the Machine is fet to any Latitude, (which is eafily done by two Men, each taking... | |
 | Encyclopedias and dictionaries - 1823 - 894 pages
...degree, through which a strong pin ¡a put at every elevation. This arch and the two hinges lupport the whole machine when it is lifted up according to...the arch at other times lies conveniently under the bottom-frame. When the machine is to be set to any latitude (which is easily done by two men, each... | |
 | Thomas Curtis - Aeronautics - 1829 - 852 pages
...degree, through which a strong pin is put at every elevation. This arch, and the two hinges, support the whole machine, when it is lifted up, according...other times, lies conveniently under the bottom frame. 763. The sun, (No. 1.) stands in the middle of the whole system, upon a wire, making an angle with... | |
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Hinges fupport the whole Machine, when it is lifted up, according to any Latitude; and the Arch, at other Times, lies conveniently under the BottomFrame. When the Machine is fet to any Latitude, (which is eafily done by two Men, each taking hold of two... 