Ushirikiano
SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
Protractor: Plain Circular Brass Protractor with a Centre Bar (Stanley, 1878)
The draughtsman's circular protractor: a flat brass ring divided all round into degrees and half-degrees, its outer edge bevelled thin so a needle point can feel the divisions, with a bar across the middle whose edge runs exactly through the centre from 0° to 180°. Lay the bar on a line, prick off the angle and draw through the point and the centre.
Result: a protractor for setting off and measuring angles on a drawing.
Source: W. F. Stanley, A Descriptive Treatise on Mathematical Drawing Instruments (1878), pp. 227-228. Unknown: sizes and how the circle is divided. Picture: the book's figure.
Kati
Unknown
Maagizo
1
1
Make the ring and bar
Make the ring and bar
Cut a flat ring of brass (electrum also serves) with a bar across the inner space. Make one side of the bar a true straight line through the centre of the ring, and mark the centre with a short line in the middle of the bar; a small semicircle may be cut out of the bar's edge there to make it easier to set over a point. Bevel the outer edge down very thin. Not given: sizes. Ours: brass sheet.
Vifaa kwa hatua hii:
Bamba la Shaba ya Njano1 ring and barZana zinazohitajika:
Mkasi wa bati
Kereza ya Chuma
Vipimo visivyojulikana2
2
Divide it
Divide it
Divide the circumference into degrees, subdivided into half-degrees, so that the bar's edge, carried on, reads 0° and 180°, and number the degrees. Not given: how the circle is divided.
Zana zinazohitajika:
Vipimo visivyojulikana3
3
Use it
Use it
To set off an angle from a point on a line, lay the bar so it half covers the line, the line reading 0 to 180, with the point in the centre. Prick off the number of degrees at the bevelled edge with a needle point, lift the protractor away, and draw a line through the mark and the point.
Zana zinazohitajika:
Vipimo visivyojulikanaVifaa
1- 1 ring and barKishikilia Nafasi
Zana Zinazohitajika
3- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
Mchoro huu unatengeneza
CC0 Umma Wote
Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.
Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.