×
+ All Categories
Log in
English
Français
Español
Deutsch
The top documents tagged [types of ballast]
Home >
types of ballast
Toric lenses and soft CL problems. Toric Lens Lenses used to correct astigmatic/sphericocylin drical patients. Toric lenses have a ballast or “weight”
225 views
Elements of Railway Tracks
222 views
ELEMENTS OF RAILWAY TRACKS. A railway track is a combination of 1. Formation 2. Ballast 3. Sleepers 4. Rails 5. Fastenings.
227 views