I am trying to search the update information of weight and weight rate of flow. This has 3 main categories:

- Fixed-Load Weighting: spring balanced scale, Pneumatic weight transmitter, etc.

- Moving-Load Weighting: solids flow meter, volumetric solids meter, radioactive transmission gage, etc.

- Weigh Feeders: scale-balanced belt feeder, loss-in-weight vibrating feeder, etc.

These brief info are from the paper printed in 1969. Could you please tell me where the updated information of these Process Instrument Elements is? It would be great! Now I am routinely updating info each by each method and I am sure I can't find all of them. Besides, I am sure there must be the compendium of the Process Instrument Elements at any place in the cyber space! Thank you for reading my request. Have a nice weekend. ■