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Silk-Thread Hygrometer with a Magnifying Sag and Pointer (Boy Mechanic, 1913)
A humidity indicator from a silk thread stretched with a slight sag between two nails: as dry air shrinks the silk, the sag straightens and pulls a second thread wound round a pencil-sized axle, swinging a pointer over a scale.
Mwanzo
An hour
Maagizo
1
1
Why the sag magnifies
Why the sag magnifies
Inapakia daftari la Jupyter…
2
2
Read the Boy Mechanic
Read the Boy Mechanic
"A very small shrinkage of B, such as occurs when the atmosphere is dry, will cause an increased movement of C."
3
3
String thread B
String thread B
Drive a nail at each end of a board A and stretch silk thread B between them, not quite straight: let it bend a little toward the pointer bracket D.
Vifaa kwa hatua hii:
Ubao wa msonobari1 kipande
Uzi wa hariri wa kushonea1 kipande
Misumari1 kipandeZana zinazohitajika:
Nyundo4
4
Make the pointer axle
Make the pointer axle
Cut a round wooden axle about the size of a lead pencil and drive a pin into each end. Cut a piece of tin E V-shaped at each end and bend the ends up as bearings for the pins; fix it on bracket D. Fix a light pointer on the axle.
Vifaa kwa hatua hii:
Vijiti vya mbao ngumu1 kipande
Pini za kushonea1 kipande
Bamba la bati1 kipandeZana zinazohitajika:
Mkasi wa bati
Koleo la Mdomo Bapa
Msumeno wa mkono5
5
Connect thread C
Connect thread C
Tie a second silk thread C to the middle of B, fasten it to the axle and wrap it once or twice round, so pulling C turns the pointer over a scale card.
Vifaa kwa hatua hii:
Uzi wa hariri wa kushonea1 kipande
Mabamba ya kadibodi ya kielelezo1 kipande6
6
Read it
Read it
When the air dries, B shrinks and straightens, pulling C and swinging the pointer; damp air lets it back. Mark the scale against a known hygrometer if you want numbers.
7
7
Troubleshooting
Troubleshooting
Hygrometer troubleshooting.
Flow
Loading...
8
8
History and honest limits
History and honest limits
From **The Boy Mechanic, Book 1** (Popular Mechanics, 1913), pp. 71-72 (checked on the archive.org scan boymechanic0000unse_n5a8). He gives no sizes or calibration; ours are marked.
Vifaa
7- 1 kipandeKishikilia Nafasi
- 2 vipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
Zana Zinazohitajika
4- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
Mchoro huu unatengeneza
Blueprint zinazohusiana
Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni
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.