BAIBD &TMXOCK. (LONDON) LTD. 



Connecting Leads for use with Platinum Resistance Pyrometers. 



5596 T Flexible Cable (4-way), indiarubber and double cotton-covered . . . . per yard 



5597 T Lead -covered Cable (4-way), for permanent installations per yard, lOd. ; per 100 yards 



5598 T Asbestos -covered Cable in Flexible Steel Sheathing (4-way). Has an inner insulation 

 of rubber . . . . . . . . . . . . . . . . per yard 



5599* Asbestos -covered Cable in Flexible Copper Sheathing . . . . . . ,, 



5600 r Stout Insulated Cable in Flexible Steel Sheathing (4-way) 



5601 T Spirally-armoured Cable (4-way). Is protected by an open-wound spiral of steel wire 



per yard 



5602 r Heavy Armoured Cable (4-way). Insulated with pure and vulcanised rubber, lead- 

 covered, braided, armoured with galvanised iron wire, braided and compounded 



per yard, 2/4 ; per 100 yards 



Any of the above can be fitted with tangs at both ends for an extra charge of 5/- ; or at one 

 end only, 2/6. 



FERY RADIATION PYROMETERS. 



The Fery Radiation Pyrometers are made in two patterns, both of which are operated by radiant heat. The 

 sensitive element in the instrument varies, however, being in the one case a small thermo-couple and in the other 

 case a small bi-metallic spiral. To distinguish clearly between the two types we have designated them as follows : 



(1) The Fery Radiation Pyrometer. 



(2) The Fery Spiral Pyrometer. 



The first of these is the more accurate instrument and has the advantage that it can be used with a recorder 

 if desired, whilst the Spiral Pyrometer is cheaper and more compact. 



These instruments are made in three standard ranges : 



500 1100 C. 600 1400 C. 800 1700 C. 



This Pyrometer consists of a telescope mounted on a tripod and connected by leads to one of our standard 

 pivoted coil millivoltmeters (see Nos. i and 2). The heat rays from the furnace are received on a concave mirror and 

 brought to a focus. Looking through the eyepiece the observer sees this image of the furnace in the small mirror, 

 and by means of a special device, is able to point the telescope on the exact spot whose temperature is required 

 and to focus it on that spot. The small sensitive thermo-couple, which is situated just behind a small hole in 

 the mirror, is therefore heated and delivers current to the millivoltmeter, which may be calibrated to read directly 

 the temperature of the body at which the telescope is pointing. 





 3 





 

 





 



3 

 3 



10 



10 



Taking the temperature of a gas retort 

 with a Fery Radiation, Pyrometer. 



5603 



CHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS- 



