BAIRD &TATLOCK (LONDON) LTD. 



this fitting ; N, if used, I inch Whitworth Pipe 



Thread. Diameter of H, il inches. 



Examples. Hot Air Main and Downcomer of Blast Furnace, Carburettors and Superheaters of Water Gas Plants, Ducts 



from large Gas Producers. 



Station 5. Stem, type Nos. 5419, 5421 or 5422, bent stem No. 5435, to keep it out of the way of work and to keep " cold 

 junction " e cool. Clamp Flange, No. 5434, fixed to wall of furnace. If stem is inserted through the top, No. 5434 need not be 

 fixed to furnace. For continuous work between 800 and nooC (1470 and 2000 F), use also Wrought-lron Sheath, No. 5436 ; 

 over 1100 C (2000 F) use Refractory Sheath, No. 5442. No. 5436 screws into No. 5434. 



Dimensions. K, about 5 inches diameter, supplied with three f-inch Whitworth Screws for fixing to furnace wall 

 t-inch and M or P5 ij inches diameter ; e, without sheath, at least 3 inches if unlined, or i| inches if brick-lined ; if with Sheath 

 M P5, at least 5 inches or 3 inches respectively ; d, to give required depth e ; h, 18 inches unless otherwise ordered. 



Examples. Small Furnaces for Tempering, Hardening, Carbonizing, High Speed Steel Treatment, and General Experimental 

 Work. 



Station 6. Stem, type No. 5420 or No. 5421, bent stem No. 5435, to keep it out of the way of work and to keep " cold 

 junction," e, cool. Clamp Hook, No. 5433, holding stem. Alloy Sheath No. 5438 screws into No. 5433. 



Dimensions. g, at least 5 inches in liquid ; d, 12 inches unless specially ordered otherwise ; h, enough to keep C away from 

 furnace heat, usually 18 inches unless ordered otherwise ; J is supplied with f-inch Whitworth bolt and nut for attachment to 

 side or lip of vessel. 



Examples. Baths of Lead or High-Melting Salt up to ioooC, Galvanizing, Tinning and Solder Baths, Aluminium and Low- 

 melting Alloys. For Barium Chloride Baths above 1000 C, with Stem No. 5432 and Refractory Sheath No. 5442. 



Station 7. Stem, type No. 5420, No. 5421 or No. 5422. Clamp Flange No. 5434, to regulate depth of insertion and to hold 

 Alloy Sheath No. 5440 or Refractory Sheath No. 5442. Stem inserted in recess to shelter it from cutting action of Furnace Gases. 

 Upright Weatherhood, No. 5447, for out of doors or dirty situations. 



Dimensions. e, at least 3 inches ; m, at least 3 inches square ; d, enough to give required depth e ; P2 or P5 screw into 

 K, which is about 5 inches in diameter ; f, not less than 12 inches, usually balance of Standard 36 inch stem. P2 or P5, ij inches 

 in diameter. 



Examples. Large Direct Fired Furnaces for Hardening, Carbonizing, Annealing and Pre-heating ; Kilns for Brick, Porcelain 

 or Glass Enamelling ; Combustion Chambers not over 1200 C ; Gases from Regenerators of Open-hearth Furnaces. 



Station 8. Special stem, type No. 5430, bent stem No. 5435, with Refractory Sheath and Clamp Socket No. 5443 

 and Hand-guard No. 5432. Connector and 20 ft. Flexible Cable No. 5453 with Portable Indicator. Alternatively this stem 

 may be connected to a Wall Type Indicator. 



Dimensions. g, not less than 4 inches nor more than 6 inches, unless specially ordered ; k and h each 24 inches unless ordered 

 otherwise ; P6 clamps on stem and is adjustable to allow of repair of Stem in case of breakage of Refractory Sheath. 



Examples. Molten Iron, Brass, Bronze and Gun-metal not over 1300 C. 



Station 9. Stem, type No. 5420 or No. 5421, bent stem No. 5435, to keep it out of the way of work. Inserted through side 

 and crossing outer fire space. Brick protection cutting off fire from stem is required as shown. Clamp Flange No. 5434 holding 

 stem. For temperatures up to 9OOC (i66oF) use Wrought-lron Sheath No. 5436, above that use Alloy Sheath No. 5440. Either 

 of these screws into No. 5434. The Outfit is shown with Wall Type Indicator in Dust-proof Cover No. 5436, in view of the furnace 

 operator, and Recorder in manager's office. 



Dimensions. k about 5 inches in diameter, M or P2, ijinches diameter and 18 inches long unless otherwise ordered, e, atleast 

 3 inches ; d, sufficient to give required depth e ; h, usually 18 inches unless ordered otherwise. 



Examples. Muffle Furnaces with Outer Fire Space, for Tempering, Hardening, Carbonizing, Annealing, Re-heating, etc. 

 The Outfit shown is particularly useful where long runs are made. 



Directions for Ordering. 



Single Outfits, both Standard and Special, are listed on pages 985-986. Accessories and Extras may be added as required. 

 Their applications are shown in Figure 8 and the prices on pages 987 and 990. Should none of the complete outfits apply, it is 

 advisable that information on the points indicated below should be stated, so thata suitable combination may be selected. If this 

 is not possible a selection may be made from the separate items listed on pages 987 to 990. each single outfit comprising a Stem, 

 Connector, Cable and Indicator or Recorder ; if for fixed installation an Extension is also needed with the Cable. 



Recommendations and quotations will be submitted free of charge on receipt of information on the points named below. 



I . What are the processes and types of apparatus for which the Pyrometers are wanted ? 



2. Is the furnace, or other containing vessel at atmospheric pressure ? If not, state the actual maximum pressure or draught. 



3. What are the highest and lowest temperatures to be measured ? Is the scale to be Centigrade or Fahrenheit ? 



4. State whether it is intended to use a Wall Type (fixed) or Portable Indicator, or a Recorder. A combined outfit with 



Wall Type Indicator and Recorder is often the most useful. See Station 9, Figure 10. 

 5. What are the dimensions of Stems ? What accessories are wanted ? Figure 10 shows the kind of information wanted. 



f in doubt, send sketches, drawing, or blue prints of apparatus. 

 6. What is the average temperature where the " cold junction " e is to be placed (see Figure 10) . If no information is given 



on this point, it will be assumed at 30 C (90 F), but the user can alter the setting at will. 



7. What is the length of Cable needed to connect each Stem to the Indicator or Recorder ? (See Standard lengths on 



585). Allow enough for bends and "up and down "wiring. Are there any long spans or other difficulties in running Cables ? 



Spare Parts. It is always advisable, particularly on export orders, to order at least one spare Stem and Sheath of each kind 



ed. This saves delay when renewals are needed. When subsequently ordering parts for instruments already delivered, the 



type and serial numbers marked on those instruments should be quoted 



984 



