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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.
Katamtaman
Unknown
Mga Tagubilin
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.
Mga materyales para sa hakbang na ito:
Hindi kilalang materyal1 fibrous board box, legs
Hindi alam na tela1 hair felt or cloth lining
Lapad na Tanso1 tank
Butas-butas na platong salaan1 trays
Hindi alam na metal1 rods, clips
Mga turnilyo ng makina1 pirasoMga kailangang kasangkapan:
Gunting na pangyero
Panghinang
Hindi alam na sukat2
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.
Mga materyales para sa hakbang na ito:
Tubong tanso3 heater and thermostat tubes
Panghinang na lata-tingga1 as needed
Kawad na nichrome1 four coilsHindi alam na metal2 rods, plates, caps
Hindi alam na materyal na insulator1 disks, headsMga kailangang kasangkapan:
Panghinang
Lagaring Pang-metal3
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.
Mga materyales para sa hakbang na ito:
Piraso ng dalawang metal1 thermostatic barHindi alam na metal1 strip, bar, bracket, contacts, screwHindi alam na materyal na insulator1 disk, head
Hanay ng Spring na Panipi1 piraso
Kit ng mga Kapasitor1 spark condenserMga kailangang kasangkapan:
Set ng mga distornilyador4
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.
Mga materyales para sa hakbang na ito:
Toggle na switch1 piraso
Sokete ng bombilya1 piraso
Bombilya1 piraso
Malambot na kordon na may plug1 pirasoMga kailangang kasangkapan:
Set ng mga distornilyadorMga Materyales
17- 1 fibrous board box, legsPlaceholder
- 1 hair felt or cloth liningPlaceholder
- 1 tankPlaceholder
- Placeholder
- 1 strip, bar, bracket, contacts, screwPlaceholder
- 1 pirasoPlaceholder
- 3 heater and thermostat tubesPlaceholder
- 1 as neededPlaceholder
- 1 four coilsPlaceholder
- 1 disk, headPlaceholder
- 1 thermostatic barPlaceholder
- 1 pirasoPlaceholder
- 1 spark condenserPlaceholder
- Placeholder
- 1 pirasoPlaceholder
- 1 pirasoPlaceholder
- 1 pirasoPlaceholder
Mga Kinakailangang Kasangkapan
5- Placeholder
- 2 vendors sell this, none ship to you yetPlaceholder
- Placeholder
- Placeholder
- Placeholder
Mga Materyales ng Nakakonektang Blueprint
Ang blueprint na ito ay gumagawa ng
CC0 Pampublikong Domain
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