Hi Larry,

       I note that you are no longer supplying the completed electronics' 
board and parts for the SG seismometer. I presume that this is a commercial 
decision. However, it seems to have been put into effect without any prior 
notification to members of psn. 

       However, would you supply a FULL PARTS & SUPPLIER LIST and ALSO either 
STOCK THE BOARDS, or arrange for a named supplier to market the latest 
design, please? This should be inexpensive for you and will provide an adequate 
service to potential constructors.

       A SG pendulum system is a lot easier to construct mechanically for a 
beginner than a Lehman. However, if NEITHER the complete electronics' board NOR 
the PCB are available, making one can only be recommended to experienced / 
skilled constructors with a reasonable chance of success. 

       Please, could you give this service to potential experimenters your 
serious consideration? I note that Prof. Randall Peters mentioned the SG 
construction in his recent letter!  
       
       Regards,

       Chris Chapman
Hi Larr=
y,



       I note that you are no longer supplying=
 the completed electronics' board and parts for the SG seismometer. I presum=
e that this is a commercial decision. However, it seems to have been put int=
o effect without any prior notification to members of psn. 



       However, would you supply a FULL PARTS=20=
& SUPPLIER LIST and ALSO either STOCK THE BOARDS, or arrange for a named=
 supplier to market the latest design, please? This should be inexpensive fo=
r you and will provide an adequate service to potential constructors.



       A SG pendulum system is a lot easier to=
 construct mechanically for a beginner than a Lehman. However, if NEITHER th=
e complete electronics' board NOR the PCB are available, making one can only=
 be recommended to experienced / skilled constructors with a reasonable chan=
ce of success. 



       Please, could you give this service to=20=
potential experimenters your serious consideration? I note that Prof. Randal=
l Peters mentioned the SG construction in his recent letter!  

       

       Regards,



       Chris Chapman