BAIRD &TATLOCK (LONDON) LTD. 



5180 T Thermometers, 30 to 120 F. in wood cases, 7 in. or 10 in. long 



5181 1 30 to 220 F. ,, 12 in. 



5182 T Taper Bulb Thermometers for Cement 



5183 T Apparatus for determining Temperature of Cement during setting 



5184 T Bohme i Hammer Apparatus and moulds for i in. briquettes. See No. 5201 



5185 T 2 ,, ,, No. 5201 



056 



056 



056 



17 6 



18 10 



25 



5186 T Cement Sampling Tins, lever top . . 



. . per doz. 6/- and 090 



With Dashpot. 

 5187 5188 5189 



5187 r Weighted Needle for testing cement 



For testing of the setting time of cement, it weighs 2j Ibs. and has a removable hardened steel point of -fa in. 

 square section. Mix a pat of cement about 6 in. x 6 in. x in thickness, place upon a glass or iron plate, and hold 

 needle by the edges of loose washer, taking care that fingers do not press against the stem. Place needle on the 

 cement pat and lower the loose washer, this leaves the needle free to penetrate the cement. The setting time 

 is from the moment of gauging until needle fails to make any impression on the cement pat. 



5188 T Vicat Needle to British Standards Specifications. For ascertaining the commencement 

 of hardening and time of setting, also the correct consistency of cement 



5189 Vicat Needle as above, with dashpot 



INSTRUCTIONS FOR USE. 



Gauge 14 ozs. of neat cement with the correct quantity of water into a stiff paste as quickly as possible, fill 

 circular brass or vulcanite mould, place same on stand as shown in sketch; the moment at which the needle of i 

 square millimetre section and 300 grammes in weight fails to penetrate to the bottom of the paste is the commence- 

 ment of the hardening. To get the full strength of the cement it should be worked and used within the time of the begin- 

 ning of gauging to commencement of hardening, 



To find the correct consistency ol the Cement. Remove the needle of i square millimetre and replace by 

 cylinder B of I centimetre in diameter. Cement is gauged and the brass or vulcanite mould filled as quickly as 

 possible, the consistency being correct when the piston remains at a height of six millimetres from the bottom 

 of the mould, the correct quantity of water required in the cement may be ascertained in this manner. 



DIRECTIONS FOR NEEDLE WITH DASHPOT. 



Fill dashpot with clean thin lubricating oil, it will then be ready for use, raise needle and insert pin in hole of 

 spindle at top of stand, place filled mould on stand, raise plunger of dashpot to under part of needle head, remove 

 pin, and needle will then travel gradually on to cement to be tested, repeat operation until test is completed. 



12 6 



1 15 

 2 10 



CROSS STREET HATTCTNT GARDEN, E-C- 



=3Si^=JJJ^ 



