CA Monitor Top

A little bit rattly in its sound, but could be because of not enough heater warm up time (assuming the heater works), or the presence of non condensable gases.
This is a 1934 CA-2-B(presumably 16) on an HT70 cabinet. The CA operates differently to all the other monitor top models in that it runs at low pressure, part of it is always in a vacuum, uses a rotary compressor, and uses a refrigerant unique to General Electric.
I'd recommend downloading the manual here members.iinet.net.au/~cool386/ge_service/CA_factory_manual.zip
There's a quick intro to the CA and a checklist here monitortop.freeforums.net/thread/12/faqs-introduction-ca
The important things first are to ensure the heater works and the NCG's if any have been purged. If the evaporator cannot get cold enough, it's a likely indication of a worn float valve.

I'll move this to the CA section.

Sounds promising so far. The top of the condenser will run warmer than the bottom and float valve in normal use once everything has stabilised, so the temperatures you are getting now are not necessarily an indicator of NCG build up.
The evaporator pics look pretty good. The frost level is about right.
Try running it under load (e.g. tray of hot water in the evaporator) and see what temperature variation from condenser to float valve you get after it's run for about 10 mins.

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"Ca monitor Top start up 
Ok cablehack I did as you ask I took amp readings ,temperatures reading and tried to do it in 5 min time periods.
Start up temp in garage 54 F. Refidgerator set at 7
When first turned on after in rush current.
Amps 2.67 
Very quiet  

5 minutes 
Amps 2.40 
Starting to get some noise 

10 minutes 
Amps 2.38 
Noisey very annoying would not want to here this in the house.

15 minutes 
Holding steady @ 2.38 still Noisey 

20 minutes 
Amps 2.38 Noisey 

The temperature variation and it being too noisy to want to have in the house are suggestive of some NCG build up. That's to be completely expected though after all the years it has been used. There's a good set of pictorial instructions about dealing with noisy CA units, which came from a GE training film made after the NCG characteristic became apparent. If you haven't already seen them, they are downloadable here members.iinet.net.au/~cool386/ge_service/sealed_units.zip

Importantly, is the heater known to be working? There should be a constant power draw of around 12W. This heater runs all the time the machine is plugged in, so you can see if it's drawing power with the compressor switched off. Failure of this heater prevents all the methyl formate leaving the compressor oil which floats on top of it, giving the appearance of low refrigerant. It also means it doesn't vaporise properly, with the liquid form causing the rattling. In extreme cases, the compressor will actually lock up.

The CA will sometimes rattle in low ambient temperatures. 54F is only 12C - that's about my kitchen temperature in winter. My CA-2 will occasionally rattle for a few seconds when the ambient is below about 15C, but never continuously. Above that, it runs so quiet I often can't tell whether its running or not without actually touching the compressor.
In your situation I would purge it - at least then you'll know it is free of NCG. But first ensure the heater works, and it's had a few hours to warm up.

Yes you can use an ohm meter. With the control turned to off you should have continuity thru only the heater if its good. If memory serves me they check somewhere around 1k Ohms. Looks like you might have a good performer in this CA. From what you describe it does sound like it needs a new heater. The MF really needs to be heated out of the oil for these to preform like new.

My digital meter will do the climbing the scale thing on ohms on a high scale.  If your reading was that high at the start the heater is toasted. Fairly easy fix and most the noise should go away.