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INDOSSABILI
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.
Intermedio
Unknown
Istruzioni
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.
Materiali per questo passaggio:
Materiale sconosciuto1 fibrous board box, legs
Tessuto sconosciuto1 hair felt or cloth lining
Lamiera di rame1 tank
Lamiera forata da vaglio1 trays
Metallo sconosciuto1 rods, clips
Viti da metallo1 pezzoStrumenti necessari:
Cesoie da lattoniere
Saldatore a stagno
Dimensioni sconosciute2
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.
Materiali per questo passaggio:
Tubo di rame3 heater and thermostat tubes
Lega saldante stagno-piombo1 as needed
Filo di nichel-cromo1 four coilsMetallo sconosciuto2 rods, plates, caps
Materiale isolante sconosciuto1 disks, headsStrumenti necessari:
Saldatore a stagno
Seghetto per metalli3
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.
Materiali per questo passaggio:
Lamina bimetallica1 thermostatic barMetallo sconosciuto1 strip, bar, bracket, contacts, screwMateriale isolante sconosciuto1 disk, head
Set di molle di compressione1 pezzo
Kit di condensatori1 spark condenserStrumenti necessari:
Set di cacciaviti4
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.
Materiali per questo passaggio:
Interruttore a levetta1 pezzo
Portalampada1 pezzo
Lampadina1 pezzo
Cavo flessibile con spina1 pezzoStrumenti necessari:
Set di cacciavitiMateriali
17- 1 fibrous board box, legsSegnaposto
- 1 hair felt or cloth liningSegnaposto
- 1 tankSegnaposto
- 1 traysSegnaposto
- 1 strip, bar, bracket, contacts, screwSegnaposto
- 1 pezzoSegnaposto
- 3 heater and thermostat tubesSegnaposto
- 1 as neededSegnaposto
- 1 four coilsSegnaposto
- 1 disk, headSegnaposto
- 1 thermostatic barSegnaposto
- 1 pezzoSegnaposto
- 1 spark condenserSegnaposto
- Segnaposto
- 1 pezzoSegnaposto
- 1 pezzoSegnaposto
- 1 pezzoSegnaposto
Strumenti richiesti
5- Segnaposto
- 2 vendors sell this, none ship to you yetSegnaposto
- Segnaposto
- Segnaposto
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