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Test-Tube Hydrometer, Shot-Loaded and Calibrated (Boy Mechanic, 1915)
A hydrometer for specific gravity made from two test tubes: the small one, weighted with shot set in plaster and corked, floats in the liquid held in the large one, and the depth it sinks is read against marks copied from a bought hydrometer.
Mwanzo
An hour plus calibration
Maagizo
1
1
How it floats
How it floats
Inapakia daftari la Jupyter…
2
2
Read the Boy Mechanic
Read the Boy Mechanic
"The specific gravity of any material is the ratio of the weights of equal volumes of the material and water."
3
3
Mount the jar
Mount the jar
Take two test tubes, one able to hold the other. Stand the large one upright in a hole bored in a small block of wood: it holds the liquid.
Vifaa kwa hatua hii:
Mirija ya majaribio1 kipande
Ubao wa Mti Mgumu1 kipandeZana zinazohitajika:
Kekee cha mkono chenye ncha4
4
Load the float
Load the float
Put shot or other heavy metal in the bottom of the small tube until it floats upright: almost wholly under water if it is for liquids heavier than water, only just upright if for lighter ones. Fix the load with a little plaster of Paris.
Vifaa kwa hatua hii:
Mirija ya majaribio1 kipande
Mche wa Risasi1 kipande
Plasta ya Paris1 kipande5
5
Seal it
Seal it
Push a small cork into the open end and seal it with shellac, or with resin or sealing wax melted over it with a hot soldering iron.
Vifaa kwa hatua hii:
Vizibo vya mzibo1 kipande
Vanishi ya shelaki1 kipande
Utomvu wa Msonobari1 kipandeZana zinazohitajika:
Chuma cha kulehemia6
6
Mark the water line
Mark the water line
Float it in the large tube filled with pure water (rain water will do, distilled is better) and file a small mark level with the surface. In lighter liquids the mark sinks below the surface; in heavier ones it rises above.
Vifaa kwa hatua hii:
Maji yaliyosafishwa kwa mvuke1 kipandeZana zinazohitajika:
Tupa (Tupa ya Mkono)7
7
Calibrate
Calibrate
Float your tube and a borrowed hydrometer in the same liquid and mark your tube to match its readings. Starting with a heavy liquid, add water little by little; both float lower each time, giving more marks.
Vifaa kwa hatua hii:
Maji yaliyosafishwa kwa mvuke1 kipandeZana zinazohitajika:
Tupa (Tupa ya Mkono)8
8
Troubleshooting
Troubleshooting
Hydrometer troubleshooting.
Flow
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9
9
History and honest limits
History and honest limits
From **The Boy Mechanic, Book 2** (Popular Mechanics, 1915), p. 456 (checked on the archive.org scan boymechanicbook200chic2). Lead ingot stands in for his shot; the float numbers are our example.
Vifaa
8- 1 kipandeKishikilia Nafasi
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- 2 vipandeKishikilia Nafasi
Zana Zinazohitajika
3- Kishikilia Nafasi
- 2 vendors sell this, none ship to you yetKishikilia Nafasi
- Kishikilia Nafasi
Mchoro huu unatengeneza
Blueprint zinazohusiana
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