BAIRD &TATLOCK (LONDON) LTD. 



5504-55C5 



Pyrometer for giving continuous records of temperature. 



iis instrument consists of a moving coil galvanometer in which the 



This instrument consists of a moving coil galvanometer in which the pointer is automatically depressed by 

 clockwork every minute. 



This forces an inked thread on to the chart and thus gives a permanent record of the temperature in the 

 form of a dot on the chart. As the pointer is depressed every r minute (or 30 seconds if preferred) and the drum 

 carrying the chart is slowly rotating, these dots merge into one continuous line. 



Usually the drum is arranged to make one revolution in 25 hours, though by means of a simple 

 change-speed arrangement it can also be made to revolve once in 2 hours 5 minutes. The usual temperature 

 ranges are o 1000 C. when used with platinum, platinum-indium couples, and o 1400 C. when used with 

 platinum, platinum-rhodium couples. The record sheet reproduced illustrates the former of these two sheets 

 and shows the type of record obtained with a Thread Recorder under Works conditions. The instrument is 

 fitted with a glass front so that at any moment the actual temperature at the time, and for the past few hours, 

 can be seen at a glance. 



We also make a " Double Thread Recorder," so called because it can be used with two thermo-couples to 

 give two records on the same chart. In the double instrument two galvanometers are arranged side by side 

 in the one case and the chart is of double the usual width so that two entirely independent and continuous records 

 are obtained. Where a customer intends to install two or more thermo-couples it is cheaper to install double 

 recorders than single ones. 



5504 T Single Thread Recorder adjusted for any standard range and complete with 100 charts. 

 Drum rotates once in 25 hours or by a simple change-speed arrangement once in 2 hours 

 5 minutes. Price without couple 



29 



5505 T Double Thread Recorder giving two independent records on a single chart of double 

 width, 100 standard charts included. Drum rotates once in 25 hours or 2 hours 5 minutes. * 

 Price without couple . . . . . . . . . . . . . . . . 42 



5506 T Spare Charts for use with Single Thread Recorder . . . . . . per 100 040 



5507 1 Double Thread Recorder .. .. .. 050 



Please specify the range of chart required when ordering. 



in CHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS. 



995 



3 s 



I 



