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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.
中级
Unknown
说明
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.
此步骤所需材料：
未知材料1 fibrous board box, legs
未知织物1 hair felt or cloth lining
铜板1 tank
冲孔筛板1 trays
未知金属1 rods, clips
机螺钉1 个所需工具：
铁皮剪
电烙铁
未知尺寸2
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.
此步骤所需材料：
铜管3 heater and thermostat tubes
锡铅焊料1 as needed
镍铬丝1 four coils未知金属2 rods, plates, caps
未知绝缘材料1 disks, heads所需工具：
电烙铁
钢锯3
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.
此步骤所需材料：
双金属片1 thermostatic bar未知金属1 strip, bar, bracket, contacts, screw未知绝缘材料1 disk, head
压缩弹簧套装1 个
电容套件1 spark condenser所需工具：
螺丝刀套装4
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.
此步骤所需材料：
钮子开关1 个
灯座1 个
灯泡1 个
带插头软线1 个所需工具：
螺丝刀套装材料
17- 1 fibrous board box, legs占位符
- 1 hair felt or cloth lining占位符
- 1 tank占位符
- 1 trays占位符
- 1 strip, bar, bracket, contacts, screw占位符
- 1 个占位符
- 3 heater and thermostat tubes占位符
- 1 as needed占位符
- 1 four coils占位符
- 1 disk, head占位符
- 1 thermostatic bar占位符
- 1 个占位符
- 1 spark condenser占位符
- 占位符
- 1 个占位符
- 1 个占位符
- 1 个占位符
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