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Water Bath: Copper Tank with Plug-In Heaters and an Air-Tube Thermostat (Lidberg, US 1,397,766, 1921)
An electric constant-temperature water bath for laboratory and bacteriological work. A copper tank sits in an insulated fibre-board box; two heater tubes and a thermostat tube are soldered through its wall so the heating coils and the switch plug in from outside. A switch adds extra coils to heat the water up quickly; then the thermostat alone holds the set temperature. Perforated trays on adjustable rods hold the tubes or flasks at the depth you choose.
Result: a thermostatic water bath that holds its water at a set temperature.
Source: T. Lidberg (Chicago Surgical & Electrical Co.), US 1,397,766 (1921). Unknown: sizes, the temperature range, the heater wire. Picture: the patent drawing.
Kati
Unknown
Maagizo
1
1
Build the insulated tank
Build the insulated tank
Make a rectangular box of fibrous board on four short legs and line it with hair felt or cloth. Set a sheet copper tank inside, its walls a little taller than the box and turned over the top edge as a bead. Make perforated trays of several shelves, each with an upright rod hooked at the top for lifting, and on each rod a sliding clip with a set screw whose end rests on the tank edge, to set how deep the tray hangs. Not given: sizes.
Vifaa kwa hatua hii:
Nyenzo isiyojulikana1 fibrous board box, legs
Kitambaa kisichojulikana1 hair felt or cloth lining
Bamba la Shaba1 tank
Bamba la chujio lenye matundu1 trays
Metali isiyojulikana1 rods, clips
Skrubu za mashine1 kipandeZana zinazohitajika:
Mkasi wa bati
Chuma cha kulehemia
Vipimo visivyojulikana2
2
Fit the heater tubes
Fit the heater tubes
Solder two watertight tubes across the tank, each closed at its inner end and open outside the wall, and a third for the thermostat. For each heater, wind two coils on a rod held in the tube by an insulating disk and an end head; join one end of each coil to the rod and the others to plates on the head, and cover the terminals with a cap plate. Slide each heater into its tube. Ours: nichrome wire. Not given: the coil ratings.
Vifaa kwa hatua hii:
Mrija wa shaba-njekundu3 heater and thermostat tubes
Lehemu ya bati na risasi1 as needed
Waya wa nikromu1 four coilsMetali isiyojulikana2 rods, plates, caps
Kihami kisichojulikana1 disks, headsZana zinazohitajika:
Chuma cha kulehemia
Msumeno wa chuma3
3
Make the air-tube thermostat
Make the air-tube thermostat
In the closed thermostat tube, mount on an insulating disk a strip carrying a thermostatic bar with a contact at its free end. Facing it, pivot an adjustable bar with its own contact on a bracket in the tube's insulating head, held by a spring against an adjusting screw with a knob outside: turning it sets the temperature at which the contacts open. Bridge the contacts with a condenser to stop sparking. The air in the tube takes the bath's temperature and bends the bar. Ours: a bimetallic strip.
Vifaa kwa hatua hii:
Ukanda wa metali mbili1 thermostatic barMetali isiyojulikana1 strip, bar, bracket, contacts, screwKihami kisichojulikana1 disk, head
Seti ya springi za kubana1 kipande
Seti ya Kapasita1 spark condenserZana zinazohitajika:
Seti ya bisibisi4
4
Wire and use it
Wire and use it
Wire one coil of each heater through the thermostat, and the other coil of each through a hand switch, with a lamp across the supply to show when current flows. To start, close the switch so all four coils heat the water up. Once it is at temperature, open the switch: the thermostat then switches its two coils on and off to hold the bath steady. Lower the trays of tubes or flasks to the depth wanted.
Vifaa kwa hatua hii:
Swichi ya mpini1 kipande
Soketi ya balbu1 kipande
Balbu ya taa1 kipande
Waya laini yenye plagi1 kipandeZana zinazohitajika:
Seti ya bisibisiVifaa
17- 1 fibrous board box, legsKishikilia Nafasi
- 1 hair felt or cloth liningKishikilia Nafasi
- 1 tankKishikilia Nafasi
- Kishikilia Nafasi
- 1 strip, bar, bracket, contacts, screwKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 3 heater and thermostat tubesKishikilia Nafasi
- 1 as neededKishikilia Nafasi
- 1 four coilsKishikilia Nafasi
- 1 disk, headKishikilia Nafasi
- 1 thermostatic barKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 spark condenserKishikilia Nafasi
- Kishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
Zana Zinazohitajika
5- Kishikilia Nafasi
- 2 vendors sell this, none ship to you yetKishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
Vifaa vya Michoro Iliyounganishwa
Mchoro huu unatengeneza
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