Web utilities

Dear Bill

I think the gremlins got into your typing on page 16 of Vol. 6, No. 1. The X-ray-Tracing Utility is just a Ray-Tracing utility and the pdf should be pdb. The address has now changed to: http://cherubino.med.jhmi.edu/~paul//. I think it is a great package myself, and am working on making it available for users of Acorn computers.

The neutron scattering lengths can also be accessed via the neutron scattering www pages at: http://www.neutron.anl.gov, which has many other links for Neutron scatterers.