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UJANJA
UTAMADUNI NA HISTORIA
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UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
Ring Stand: a Brass Rod on a Board Foot with Sliding Rings (Faraday, 1830)
A stand that holds flasks and basins at any height over a lamp or furnace. Michael Faraday (1830) describes the retort-stand: an upright brass rod on a heavy foot, with rings of several sizes, each on an arm whose socket slides up and down the rod and is fixed by a screw-nut at the back.
Brass feet filled with lead tip over under a heavy vessel, so he makes the foot a stout board about 12 x 6 x 1 inches, the rod fixed 1 1/2 inches from one end, and stands the lamp or furnace on the board under the ring.
Source: M. Faraday, Chemical Manipulation (1830), §386, p. 175. Picture: his woodcut.
Mwanzo
Unknown
Maagizo
1
1
Read Faraday
Read Faraday
"It is much better to make the foot of a piece of stout board, about twelve inches in length, six inches in width, and an inch thick. The upright rod should be fixed about one inch and a half from one end of it, the lamp or furnace should be placed upon it, and the ring of course in a corresponding direction. Such an arrangement is perfectly steady, and cannot be overset by any weight which it is strong enough to bear."
2
2
Fix the rod in the board
Fix the rod in the board
Take a stout board about 12 in. long, 6 in. wide and 1 in. thick. Fix an upright brass rod in it about 1 1/2 in. from one end. Rod size, and how it is fixed, are not given (unknown). Ours: a hardwood board.
Vifaa kwa hatua hii:
Ubao wa Mti Mgumu1 futi
Ufito wa shaba ya njano1 upright
Plagi au soketi isiyojulikana1 kipandeZana zinazohitajika:
Vipimo visivyojulikana3
3
Make the rings
Make the rings
Make several rings of different sizes, each fixed to an arm, and each arm to a socket that slides freely up and down the rod. Fit each socket with a screw-nut at the back to tighten it at any height. The metal and sizes are not given (unknown). Ours: wing nuts for the screw-nuts.
Vifaa kwa hatua hii:
Metali isiyojulikana1 rings, arms, sockets
Nati ya mabawa1 kipandeZana zinazohitajika:
Vipimo visivyojulikana4
4
Use it
Use it
Stand the lamp or furnace on the board and turn the ring over it. Slide the ring to the height wanted and tighten the screw. Do not set a hot flask on a cold ring, or a cold, freshly filled flask on a hot ring over the fire: the bottom may come out (Faraday §388).
Vifaa
5- 1 futiKishikilia Nafasi
- 1 uprightKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 rings, arms, socketsKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
Zana Zinazohitajika
1- Kishikilia Nafasi
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